97993531 has 2 divisors, whose sum is σ = 97993532. Its totient is φ = 97993530.

The previous prime is 97993499. The next prime is 97993549. The reversal of 97993531 is 13539979.

It is a strong prime.

It is an emirp because it is prime and its reverse (13539979) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97993531 - 2⁵ = 97993499 is a prime.

It is a super-2 number, since 2×97993531² = 19205464235695922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (97993031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48996765 + 48996766.

It is an arithmetic number, because the mean of its divisors is an integer number (48996766).

Almost surely, 2^97993531 is an apocalyptic number.

97993531 is a deficient number, since it is larger than the sum of its proper divisors (1).

97993531 is an equidigital number, since it uses as much as digits as its factorization.

97993531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 229635, while the sum is 46.

The square root of 97993531 is about 9899.1681973790. The cubic root of 97993531 is about 461.0334844546.

The spelling of 97993531 in words is "ninety-seven million, nine hundred ninety-three thousand, five hundred thirty-one".