129601531 has 2 divisors, whose sum is σ = 129601532. Its totient is φ = 129601530.

The previous prime is 129601487. The next prime is 129601547. The reversal of 129601531 is 135106921.

It is a strong prime.

It is an emirp because it is prime and its reverse (135106921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129601531 - 2⁹ = 129601019 is a prime.

It is a super-2 number, since 2×129601531² = 33593113675087922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129601531.

It is not a weakly prime, because it can be changed into another prime (129601561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64800765 + 64800766.

It is an arithmetic number, because the mean of its divisors is an integer number (64800766).

Almost surely, 2^129601531 is an apocalyptic number.

129601531 is a deficient number, since it is larger than the sum of its proper divisors (1).

129601531 is an equidigital number, since it uses as much as digits as its factorization.

129601531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 129601531 is about 11384.2668187284. The cubic root of 129601531 is about 506.0615919130.

The spelling of 129601531 in words is "one hundred twenty-nine million, six hundred one thousand, five hundred thirty-one".