97979531 has 4 divisors (see below), whose sum is σ = 105516432. Its totient is φ = 90442632.

The previous prime is 97979509. The next prime is 97979533. The reversal of 97979531 is 13597979.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13597979 = 2447 ⋅5557.

It is a cyclic number.

It is not a de Polignac number, because 97979531 - 2¹⁴ = 97963147 is a prime.

It is a super-2 number, since 2×97979531² = 19199976989959922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 97979531.

It is not an unprimeable number, because it can be changed into a prime (97979533) 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, 3768431 + ... + 3768456.

It is an arithmetic number, because the mean of its divisors is an integer number (26379108).

Almost surely, 2^97979531 is an apocalyptic number.

97979531 is a deficient number, since it is larger than the sum of its proper divisors (7536901).

97979531 is a wasteful number, since it uses less digits than its factorization.

97979531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7536900.

The product of its digits is 535815, while the sum is 50.

The square root of 97979531 is about 9898.4610420004. The cubic root of 97979531 is about 461.0115279842.

The spelling of 97979531 in words is "ninety-seven million, nine hundred seventy-nine thousand, five hundred thirty-one".