97509531 has 16 divisors (see below), whose sum is σ = 150623744. Its totient is φ = 54955584.

The previous prime is 97509527. The next prime is 97509563. The reversal of 97509531 is 13590579.

It is not a de Polignac number, because 97509531 - 2² = 97509527 is a prime.

It is a super-3 number, since 3×97509531³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 97509531.

It is not an unprimeable number, because it can be changed into a prime (97549531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30271 + ... + 33336.

It is an arithmetic number, because the mean of its divisors is an integer number (9413984).

Almost surely, 2^97509531 is an apocalyptic number.

97509531 is a deficient number, since it is larger than the sum of its proper divisors (53114213).

97509531 is a wasteful number, since it uses less digits than its factorization.

97509531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63690.

The product of its (nonzero) digits is 42525, while the sum is 39.

The square root of 97509531 is about 9874.6914382172. The cubic root of 97509531 is about 460.2732009737.

The spelling of 97509531 in words is "ninety-seven million, five hundred nine thousand, five hundred thirty-one".