172430729 has 2 divisors, whose sum is σ = 172430730. Its totient is φ = 172430728.

The previous prime is 172430717. The next prime is 172430759. The reversal of 172430729 is 927034271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152646025 + 19784704 = 12355^2 + 4448^2 .

It is a cyclic number.

It is not a de Polignac number, because 172430729 - 2¹² = 172426633 is a prime.

It is not a weakly prime, because it can be changed into another prime (172430759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86215364 + 86215365.

It is an arithmetic number, because the mean of its divisors is an integer number (86215365).

Almost surely, 2^172430729 is an apocalyptic number.

It is an amenable number.

172430729 is a deficient number, since it is larger than the sum of its proper divisors (1).

172430729 is an equidigital number, since it uses as much as digits as its factorization.

172430729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 172430729 is about 13131.2881698636. The cubic root of 172430729 is about 556.5936168540.

The spelling of 172430729 in words is "one hundred seventy-two million, four hundred thirty thousand, seven hundred twenty-nine".