1231557552 has 60 divisors (see below), whose sum is σ = 3498120600. Its totient is φ = 404388864.

The previous prime is 1231557473. The next prime is 1231557557. The reversal of 1231557552 is 2557551321.

1231557552 is a `hidden beast` number, since 1 + 2 + 31 + 5 + 575 + 52 = 666.

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 (1231557557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54177 + ... + 73472.

It is an arithmetic number, because the mean of its divisors is an integer number (58302010).

Almost surely, 2^1231557552 is an apocalyptic number.

1231557552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1231557552 is an abundant number, since it is smaller than the sum of its proper divisors (2266563048).

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

1231557552 is a wasteful number, since it uses less digits than its factorization.

1231557552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127730 (or 127721 counting only the distinct ones).

The product of its digits is 52500, while the sum is 36.

The square root of 1231557552 is about 35093.5542799529. The cubic root of 1231557552 is about 1071.8933351583.

The spelling of 1231557552 in words is "one billion, two hundred thirty-one million, five hundred fifty-seven thousand, five hundred fifty-two".