97811131 has 4 divisors (see below), whose sum is σ = 106703064. Its totient is φ = 88919200.

The previous prime is 97811099. The next prime is 97811137. The reversal of 97811131 is 13111879.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 97811131 - 2⁵ = 97811099 is a prime.

It is a super-2 number, since 2×97811131² = 19134034694998322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 97811093 and 97811102.

It is not an unprimeable number, because it can be changed into a prime (97811137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4445950 + ... + 4445971.

It is an arithmetic number, because the mean of its divisors is an integer number (26675766).

Almost surely, 2^97811131 is an apocalyptic number.

97811131 is a deficient number, since it is larger than the sum of its proper divisors (8891933).

97811131 is a wasteful number, since it uses less digits than its factorization.

97811131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8891932.

The product of its digits is 1512, while the sum is 31.

The square root of 97811131 is about 9889.9510110010. The cubic root of 97811131 is about 460.7472589734.

The spelling of 97811131 in words is "ninety-seven million, eight hundred eleven thousand, one hundred thirty-one".