1231955648 has 168 divisors, whose sum is σ = 3152265984. Its totient is φ = 472281600.

The previous prime is 1231955639. The next prime is 1231955657. The reversal of 1231955648 is 8465591321.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1231955639) and next prime (1231955657).

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 1231955599 and 1231955608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2448965 + ... + 2449467.

It is an arithmetic number, because the mean of its divisors is an integer number (18763488).

Almost surely, 2^1231955648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231955648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1576132992).

1231955648 is an abundant number, since it is smaller than the sum of its proper divisors (1920310336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231955648 is a wasteful number, since it uses less digits than its factorization.

1231955648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611 (or 594 counting only the distinct ones).

The product of its digits is 259200, while the sum is 44.

The square root of 1231955648 is about 35099.2257464463. The cubic root of 1231955648 is about 1072.0088177785.

The spelling of 1231955648 in words is "one billion, two hundred thirty-one million, nine hundred fifty-five thousand, six hundred forty-eight".