129217625 has 8 divisors (see below), whose sum is σ = 161263752. Its totient is φ = 103374000.

The previous prime is 129217589. The next prime is 129217633. The reversal of 129217625 is 526712921.

It can be written as a sum of positive squares in 4 ways, for example, as 99856 + 129117769 = 316^2 + 11363^2 .

It is not a de Polignac number, because 129217625 - 2¹² = 129213529 is a prime.

It is a super-2 number, since 2×129217625² = 33394389221281250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 516746 + ... + 516995.

It is an arithmetic number, because the mean of its divisors is an integer number (20157969).

Almost surely, 2^129217625 is an apocalyptic number.

It is an amenable number.

129217625 is a deficient number, since it is larger than the sum of its proper divisors (32046127).

129217625 is an equidigital number, since it uses as much as digits as its factorization.

129217625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033756 (or 1033746 counting only the distinct ones).

The product of its digits is 15120, while the sum is 35.

The square root of 129217625 is about 11367.3930608561. The cubic root of 129217625 is about 505.5614120447.

The spelling of 129217625 in words is "one hundred twenty-nine million, two hundred seventeen thousand, six hundred twenty-five".