76172561 has 2 divisors, whose sum is σ = 76172562. Its totient is φ = 76172560.

The previous prime is 76172513. The next prime is 76172567. The reversal of 76172561 is 16527167.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70140625 + 6031936 = 8375^2 + 2456^2 .

It is a cyclic number.

It is not a de Polignac number, because 76172561 - 2⁶ = 76172497 is a prime.

It is not a weakly prime, because it can be changed into another prime (76172567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38086280 + 38086281.

It is an arithmetic number, because the mean of its divisors is an integer number (38086281).

Almost surely, 2^76172561 is an apocalyptic number.

It is an amenable number.

76172561 is a deficient number, since it is larger than the sum of its proper divisors (1).

76172561 is an equidigital number, since it uses as much as digits as its factorization.

76172561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 35.

The square root of 76172561 is about 8727.6893276514. The cubic root of 76172561 is about 423.9027029178.

The spelling of 76172561 in words is "seventy-six million, one hundred seventy-two thousand, five hundred sixty-one".