1231154964 has 120 divisors (see below), whose sum is σ = 3483406080. Its totient is φ = 376923456.

The previous prime is 1231154963. The next prime is 1231154999. The reversal of 1231154964 is 4694511321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231154963) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1006057 + ... + 1007279.

It is an arithmetic number, because the mean of its divisors is an integer number (29028384).

Almost surely, 2^1231154964 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 1231154964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1741703040).

1231154964 is an abundant number, since it is smaller than the sum of its proper divisors (2252251116).

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

1231154964 is a wasteful number, since it uses less digits than its factorization.

1231154964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491 (or 1480 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 1231154964 is about 35087.8178859843. The cubic root of 1231154964 is about 1071.7765241538.

The spelling of 1231154964 in words is "one billion, two hundred thirty-one million, one hundred fifty-four thousand, nine hundred sixty-four".