129988531 has 2 divisors, whose sum is σ = 129988532. Its totient is φ = 129988530.

The previous prime is 129988517. The next prime is 129988543. The reversal of 129988531 is 135889921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129988531 - 2⁷ = 129988403 is a prime.

It is a super-2 number, since 2×129988531² = 33794036383075922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129983531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64994265 + 64994266.

It is an arithmetic number, because the mean of its divisors is an integer number (64994266).

Almost surely, 2^129988531 is an apocalyptic number.

129988531 is a deficient number, since it is larger than the sum of its proper divisors (1).

129988531 is an equidigital number, since it uses as much as digits as its factorization.

129988531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 46.

The square root of 129988531 is about 11401.2512909768. The cubic root of 129988531 is about 506.5648041320.

The spelling of 129988531 in words is "one hundred twenty-nine million, nine hundred eighty-eight thousand, five hundred thirty-one".