172876261 has 2 divisors, whose sum is σ = 172876262. Its totient is φ = 172876260.

The previous prime is 172876241. The next prime is 172876271. The reversal of 172876261 is 162678271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90611361 + 82264900 = 9519^2 + 9070^2 .

It is a cyclic number.

It is not a de Polignac number, because 172876261 - 2¹⁵ = 172843493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172876241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86438130 + 86438131.

It is an arithmetic number, because the mean of its divisors is an integer number (86438131).

Almost surely, 2^172876261 is an apocalyptic number.

It is an amenable number.

172876261 is a deficient number, since it is larger than the sum of its proper divisors (1).

172876261 is an equidigital number, since it uses as much as digits as its factorization.

172876261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 40.

The square root of 172876261 is about 13148.2417455719. The cubic root of 172876261 is about 557.0725859934.

The spelling of 172876261 in words is "one hundred seventy-two million, eight hundred seventy-six thousand, two hundred sixty-one".