172291723 has 2 divisors, whose sum is σ = 172291724. Its totient is φ = 172291722.

The previous prime is 172291703. The next prime is 172291733. The reversal of 172291723 is 327192271.

172291723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172291723 is a prime.

It is not a weakly prime, because it can be changed into another prime (172291703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86145861 + 86145862.

It is an arithmetic number, because the mean of its divisors is an integer number (86145862).

Almost surely, 2^172291723 is an apocalyptic number.

172291723 is a deficient number, since it is larger than the sum of its proper divisors (1).

172291723 is an equidigital number, since it uses as much as digits as its factorization.

172291723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 34.

The square root of 172291723 is about 13125.9941718713. The cubic root of 172291723 is about 556.4440096218. Note that the first 3 decimals are identical.

The spelling of 172291723 in words is "one hundred seventy-two million, two hundred ninety-one thousand, seven hundred twenty-three".