97531538 has 16 divisors (see below), whose sum is σ = 161395416. Its totient is φ = 43916160.

The previous prime is 97531537. The next prime is 97531571. The reversal of 97531538 is 83513579.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 72301009 + 25230529 = 8503^2 + 5023^2 .

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a junction number, because it is equal to n+sod(n) for n = 97531495 and 97531504.

It is not an unprimeable number, because it can be changed into a prime (97531531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44681 + ... + 46812.

Almost surely, 2^97531538 is an apocalyptic number.

97531538 is a deficient number, since it is larger than the sum of its proper divisors (63863878).

97531538 is a wasteful number, since it uses less digits than its factorization.

97531538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91549.

The product of its digits is 113400, while the sum is 41.

The square root of 97531538 is about 9875.8056886514. The cubic root of 97531538 is about 460.3078248383.

The spelling of 97531538 in words is "ninety-seven million, five hundred thirty-one thousand, five hundred thirty-eight".