97661231 has 2 divisors, whose sum is σ = 97661232. Its totient is φ = 97661230.

The previous prime is 97661227. The next prime is 97661237. The reversal of 97661231 is 13216679.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 97661231 - 2² = 97661227 is a prime.

It is a super-2 number, since 2×97661231² = 19075432080870722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 97661191 and 97661200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97661237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48830615 + 48830616.

It is an arithmetic number, because the mean of its divisors is an integer number (48830616).

Almost surely, 2^97661231 is an apocalyptic number.

97661231 is a deficient number, since it is larger than the sum of its proper divisors (1).

97661231 is an equidigital number, since it uses as much as digits as its factorization.

97661231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 35.

The square root of 97661231 is about 9882.3697056931. The cubic root of 97661231 is about 460.5117665989.

The spelling of 97661231 in words is "ninety-seven million, six hundred sixty-one thousand, two hundred thirty-one".