172479761 has 2 divisors, whose sum is σ = 172479762. Its totient is φ = 172479760.

The previous prime is 172479731. The next prime is 172479781. The reversal of 172479761 is 167974271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107516161 + 64963600 = 10369^2 + 8060^2 .

It is a cyclic number.

It is not a de Polignac number, because 172479761 - 2¹⁰ = 172478737 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (172479731) 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, 86239880 + 86239881.

It is an arithmetic number, because the mean of its divisors is an integer number (86239881).

Almost surely, 2^172479761 is an apocalyptic number.

It is an amenable number.

172479761 is a deficient number, since it is larger than the sum of its proper divisors (1).

172479761 is an equidigital number, since it uses as much as digits as its factorization.

172479761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 148176, while the sum is 44.

The square root of 172479761 is about 13133.1550284004. The cubic root of 172479761 is about 556.6463690752.

The spelling of 172479761 in words is "one hundred seventy-two million, four hundred seventy-nine thousand, seven hundred sixty-one".