172716129 has 12 divisors (see below), whose sum is σ = 249686736. Its totient is φ = 115048152.

The previous prime is 172716121. The next prime is 172716133. The reversal of 172716129 is 921617271.

It is a happy number.

172716129 is a `hidden beast` number, since 17 + 27 + 1 + 612 + 9 = 666.

It is not a de Polignac number, because 172716129 - 2³ = 172716121 is a prime.

It is a super-2 number, since 2×172716129² = 59661722433489282, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 172716093 and 172716102.

It is not an unprimeable number, because it can be changed into a prime (172716121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4422 + ... + 19104.

It is an arithmetic number, because the mean of its divisors is an integer number (20807228).

Almost surely, 2^172716129 is an apocalyptic number.

It is an amenable number.

172716129 is a deficient number, since it is larger than the sum of its proper divisors (76970607).

172716129 is a wasteful number, since it uses less digits than its factorization.

172716129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15996 (or 15993 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The square root of 172716129 is about 13142.1508513637. The cubic root of 172716129 is about 556.9005309369.

The spelling of 172716129 in words is "one hundred seventy-two million, seven hundred sixteen thousand, one hundred twenty-nine".