172616557 has 2 divisors, whose sum is σ = 172616558. Its totient is φ = 172616556.

The previous prime is 172616551. The next prime is 172616569. The reversal of 172616557 is 755616271.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119705481 + 52911076 = 10941^2 + 7274^2 .

It is an emirp because it is prime and its reverse (755616271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172616557 - 2⁷ = 172616429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172616551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86308278 + 86308279.

It is an arithmetic number, because the mean of its divisors is an integer number (86308279).

Almost surely, 2^172616557 is an apocalyptic number.

It is an amenable number.

172616557 is a deficient number, since it is larger than the sum of its proper divisors (1).

172616557 is an equidigital number, since it uses as much as digits as its factorization.

172616557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88200, while the sum is 40.

The square root of 172616557 is about 13138.3620364184. The cubic root of 172616557 is about 556.7934914082.

The spelling of 172616557 in words is "one hundred seventy-two million, six hundred sixteen thousand, five hundred fifty-seven".