1156991652 has 36 divisors (see below), whose sum is σ = 2974193040. Its totient is φ = 379126512.

The previous prime is 1156991651. The next prime is 1156991657. The reversal of 1156991652 is 2561996511.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 1156991598 and 1156991607.

It is not an unprimeable number, because it can be changed into a prime (1156991651) 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, 270238 + ... + 274485.

Almost surely, 2^1156991652 is an apocalyptic number.

1156991652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1156991652 is an abundant number, since it is smaller than the sum of its proper divisors (1817201388).

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

1156991652 is a wasteful number, since it uses less digits than its factorization.

1156991652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544792 (or 544787 counting only the distinct ones).

The product of its digits is 145800, while the sum is 45.

The square root of 1156991652 is about 34014.5799915272. The cubic root of 1156991652 is about 1049.8084766323.

The spelling of 1156991652 in words is "one billion, one hundred fifty-six million, nine hundred ninety-one thousand, six hundred fifty-two".