172113551 has 2 divisors, whose sum is σ = 172113552. Its totient is φ = 172113550.

The previous prime is 172113541. The next prime is 172113607. The reversal of 172113551 is 155311271.

172113551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172113551 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172113551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172113541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86056775 + 86056776.

It is an arithmetic number, because the mean of its divisors is an integer number (86056776).

Almost surely, 2^172113551 is an apocalyptic number.

172113551 is a deficient number, since it is larger than the sum of its proper divisors (1).

172113551 is an equidigital number, since it uses as much as digits as its factorization.

172113551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1050, while the sum is 26.

The square root of 172113551 is about 13119.2054256346. The cubic root of 172113551 is about 556.2521316924.

The spelling of 172113551 in words is "one hundred seventy-two million, one hundred thirteen thousand, five hundred fifty-one".