97555531 has 4 divisors (see below), whose sum is σ = 99154864. Its totient is φ = 95956200.

The previous prime is 97555483. The next prime is 97555553. The reversal of 97555531 is 13555579.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 97555531 - 2¹¹ = 97553483 is a prime.

It is a super-2 number, since 2×97555531² = 19034163257383922, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (97555331) 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, 799575 + ... + 799696.

It is an arithmetic number, because the mean of its divisors is an integer number (24788716).

Almost surely, 2^97555531 is an apocalyptic number.

97555531 is a deficient number, since it is larger than the sum of its proper divisors (1599333).

97555531 is a wasteful number, since it uses less digits than its factorization.

97555531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1599332.

The product of its digits is 118125, while the sum is 40.

The square root of 97555531 is about 9877.0203502878. The cubic root of 97555531 is about 460.3455673654.

The spelling of 97555531 in words is "ninety-seven million, five hundred fifty-five thousand, five hundred thirty-one".