97391531 has 2 divisors, whose sum is σ = 97391532. Its totient is φ = 97391530.

The previous prime is 97391513. The next prime is 97391537. The reversal of 97391531 is 13519379.

Together with previous prime (97391513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 97391531 - 2¹⁰ = 97390507 is a prime.

It is a super-2 number, since 2×97391531² = 18970220621047922, which contains 22 as substring.

It is a Chen prime.

It is equal to p_5619764 and since 97391531 and 5619764 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (97391537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48695765 + 48695766.

It is an arithmetic number, because the mean of its divisors is an integer number (48695766).

Almost surely, 2^97391531 is an apocalyptic number.

97391531 is a deficient number, since it is larger than the sum of its proper divisors (1).

97391531 is an equidigital number, since it uses as much as digits as its factorization.

97391531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25515, while the sum is 38.

The square root of 97391531 is about 9868.7147592784. The cubic root of 97391531 is about 460.0874613154.

The spelling of 97391531 in words is "ninety-seven million, three hundred ninety-one thousand, five hundred thirty-one".