99988531 has 2 divisors, whose sum is σ = 99988532. Its totient is φ = 99988530.

The previous prime is 99988489. The next prime is 99988571. The reversal of 99988531 is 13588999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99988531 - 2⁷ = 99988403 is a prime.

It is a super-2 number, since 2×99988531² = 19995412663075922, which contains 22 as substring.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (99988571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49994265 + 49994266.

It is an arithmetic number, because the mean of its divisors is an integer number (49994266).

Almost surely, 2^99988531 is an apocalyptic number.

99988531 is a deficient number, since it is larger than the sum of its proper divisors (1).

99988531 is an equidigital number, since it uses as much as digits as its factorization.

99988531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 52.

The square root of 99988531 is about 9999.4265335568. The cubic root of 99988531 is about 464.1411378887.

The spelling of 99988531 in words is "ninety-nine million, nine hundred eighty-eight thousand, five hundred thirty-one".