1172152656 has 120 divisors (see below), whose sum is σ = 3422392064. Its totient is φ = 374077440.

The previous prime is 1172152651. The next prime is 1172152661. The reversal of 1172152656 is 6562512711.

1172152656 is a `hidden beast` number, since 11 + 72 + 1 + 526 + 56 = 666.

It is an interprime number because it is at equal distance from previous prime (1172152651) and next prime (1172152661).

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

It is a self number, because there is not a number n which added to its sum of digits gives 1172152656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1172152651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 431655 + ... + 434361.

Almost surely, 2^1172152656 is an apocalyptic number.

1172152656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1172152656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1711196032).

1172152656 is an abundant number, since it is smaller than the sum of its proper divisors (2250239408).

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

1172152656 is a wasteful number, since it uses less digits than its factorization.

1172152656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2849 (or 2840 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 1172152656 is about 34236.7150293366. The cubic root of 1172152656 is about 1054.3740905240.

The spelling of 1172152656 in words is "one billion, one hundred seventy-two million, one hundred fifty-two thousand, six hundred fifty-six".