997851156 has 24 divisors (see below), whose sum is σ = 2331213024. Its totient is φ = 332203680.

The previous prime is 997851131. The next prime is 997851161. The reversal of 997851156 is 651158799.

It is a junction number, because it is equal to n+sod(n) for n = 997851099 and 997851108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41535 + ... + 60998.

It is an arithmetic number, because the mean of its divisors is an integer number (97133876).

Almost surely, 2^997851156 is an apocalyptic number.

997851156 is the 19979-th centered pentagonal number.

It is an amenable number.

997851156 is an abundant number, since it is smaller than the sum of its proper divisors (1333361868).

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

997851156 is a wasteful number, since it uses less digits than its factorization.

997851156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103351 (or 103349 counting only the distinct ones).

The product of its digits is 680400, while the sum is 51.

The square root of 997851156 is about 31588.7821227726. The cubic root of 997851156 is about 999.2832049943.

The spelling of 997851156 in words is "nine hundred ninety-seven million, eight hundred fifty-one thousand, one hundred fifty-six".