97431261 has 4 divisors (see below), whose sum is σ = 129908352. Its totient is φ = 64954172.

The previous prime is 97431251. The next prime is 97431263. The reversal of 97431261 is 16213479.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 97431261 - 2²⁵ = 63876829 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97431263) 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, 16238541 + ... + 16238546.

It is an arithmetic number, because the mean of its divisors is an integer number (32477088).

Almost surely, 2^97431261 is an apocalyptic number.

It is an amenable number.

97431261 is a deficient number, since it is larger than the sum of its proper divisors (32477091).

97431261 is a wasteful number, since it uses less digits than its factorization.

97431261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32477090.

The product of its digits is 9072, while the sum is 33.

The square root of 97431261 is about 9870.7274807888. The cubic root of 97431261 is about 460.1500156587.

The spelling of 97431261 in words is "ninety-seven million, four hundred thirty-one thousand, two hundred sixty-one".