172136479 has 2 divisors, whose sum is σ = 172136480. Its totient is φ = 172136478.

The previous prime is 172136477. The next prime is 172136533. The reversal of 172136479 is 974631271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172136479 - 2¹ = 172136477 is a prime.

Together with 172136477, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172136473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86068239 + 86068240.

It is an arithmetic number, because the mean of its divisors is an integer number (86068240).

Almost surely, 2^172136479 is an apocalyptic number.

172136479 is a deficient number, since it is larger than the sum of its proper divisors (1).

172136479 is an equidigital number, since it uses as much as digits as its factorization.

172136479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 40.

The square root of 172136479 is about 13120.0792299437. The cubic root of 172136479 is about 556.2768308566.

The spelling of 172136479 in words is "one hundred seventy-two million, one hundred thirty-six thousand, four hundred seventy-nine".