97691831 has 4 divisors (see below), whose sum is σ = 97737192. Its totient is φ = 97646472.

The previous prime is 97691813. The next prime is 97691849. The reversal of 97691831 is 13819679.

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

It is an interprime number because it is at equal distance from previous prime (97691813) and next prime (97691849).

It is a cyclic number.

It is not a de Polignac number, because 97691831 - 2²⁶ = 30582967 is a prime.

It is a super-2 number, since 2×97691831² = 19087387688265122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97691851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19280 + ... + 23813.

It is an arithmetic number, because the mean of its divisors is an integer number (24434298).

Almost surely, 2^97691831 is an apocalyptic number.

97691831 is a deficient number, since it is larger than the sum of its proper divisors (45361).

97691831 is a wasteful number, since it uses less digits than its factorization.

97691831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45360.

The product of its digits is 81648, while the sum is 44.

The square root of 97691831 is about 9883.9177960968. The cubic root of 97691831 is about 460.5598586562.

The spelling of 97691831 in words is "ninety-seven million, six hundred ninety-one thousand, eight hundred thirty-one".