172057681 has 2 divisors, whose sum is σ = 172057682. Its totient is φ = 172057680.

The previous prime is 172057661. The next prime is 172057723. The reversal of 172057681 is 186750271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126360081 + 45697600 = 11241^2 + 6760^2 .

It is a cyclic number.

It is not a de Polignac number, because 172057681 - 2⁵ = 172057649 is a prime.

It is a super-2 number, since 2×172057681² = 59207691182195522, 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 172057681.

It is not a weakly prime, because it can be changed into another prime (172057621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86028840 + 86028841.

It is an arithmetic number, because the mean of its divisors is an integer number (86028841).

Almost surely, 2^172057681 is an apocalyptic number.

It is an amenable number.

172057681 is a deficient number, since it is larger than the sum of its proper divisors (1).

172057681 is an equidigital number, since it uses as much as digits as its factorization.

172057681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520, while the sum is 37.

The square root of 172057681 is about 13117.0759317769. The cubic root of 172057681 is about 556.1919366065.

The spelling of 172057681 in words is "one hundred seventy-two million, fifty-seven thousand, six hundred eighty-one".