172372961 has 2 divisors, whose sum is σ = 172372962. Its totient is φ = 172372960.

The previous prime is 172372957. The next prime is 172372999. The reversal of 172372961 is 169273271.

It is an a-pointer prime, because the next prime (172372999) can be obtained adding 172372961 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102900736 + 69472225 = 10144^2 + 8335^2 .

It is a cyclic number.

It is not a de Polignac number, because 172372961 - 2² = 172372957 is a prime.

It is not a weakly prime, because it can be changed into another prime (172372901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86186480 + 86186481.

It is an arithmetic number, because the mean of its divisors is an integer number (86186481).

Almost surely, 2^172372961 is an apocalyptic number.

It is an amenable number.

172372961 is a deficient number, since it is larger than the sum of its proper divisors (1).

172372961 is an equidigital number, since it uses as much as digits as its factorization.

172372961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 38.

The square root of 172372961 is about 13129.0883537281. The cubic root of 172372961 is about 556.5314529702.

The spelling of 172372961 in words is "one hundred seventy-two million, three hundred seventy-two thousand, nine hundred sixty-one".