172042757 has 2 divisors, whose sum is σ = 172042758. Its totient is φ = 172042756.

The previous prime is 172042723. The next prime is 172042831. The reversal of 172042757 is 757240271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170406916 + 1635841 = 13054^2 + 1279^2 .

It is an emirp because it is prime and its reverse (757240271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172042757 - 2⁸ = 172042501 is a prime.

It is a super-2 number, since 2×172042757² = 59197420472322098, which contains 22 as substring.

It is equal to p_9610982 and since 172042757 and 9610982 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172042457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86021378 + 86021379.

It is an arithmetic number, because the mean of its divisors is an integer number (86021379).

Almost surely, 2^172042757 is an apocalyptic number.

It is an amenable number.

172042757 is a deficient number, since it is larger than the sum of its proper divisors (1).

172042757 is an equidigital number, since it uses as much as digits as its factorization.

172042757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27440, while the sum is 35.

The square root of 172042757 is about 13116.5070426543. The cubic root of 172042757 is about 556.1758550839.

The spelling of 172042757 in words is "one hundred seventy-two million, forty-two thousand, seven hundred fifty-seven".