97428631 has 4 divisors (see below), whose sum is σ = 97460272. Its totient is φ = 97396992.

The previous prime is 97428623. The next prime is 97428641. The reversal of 97428631 is 13682479.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13682479 = 41 ⋅333719.

It is a cyclic number.

It is not a de Polignac number, because 97428631 - 2³ = 97428623 is a prime.

It is a super-2 number, since 2×97428631² = 18984676277068322, 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 (97428641) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10635 + ... + 17548.

It is an arithmetic number, because the mean of its divisors is an integer number (24365068).

Almost surely, 2^97428631 is an apocalyptic number.

97428631 is a deficient number, since it is larger than the sum of its proper divisors (31641).

97428631 is a wasteful number, since it uses less digits than its factorization.

97428631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31640.

The product of its digits is 72576, while the sum is 40.

The square root of 97428631 is about 9870.5942576929. The cubic root of 97428631 is about 460.1458752852.

The spelling of 97428631 in words is "ninety-seven million, four hundred twenty-eight thousand, six hundred thirty-one".