654172539 has 4 divisors (see below), whose sum is σ = 872230056. Its totient is φ = 436115024.

The previous prime is 654172511. The next prime is 654172573. The reversal of 654172539 is 935271456.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 654172539 - 2⁷ = 654172411 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 654172539.

It is not an unprimeable number, because it can be changed into a prime (654172039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109028754 + ... + 109028759.

It is an arithmetic number, because the mean of its divisors is an integer number (218057514).

Almost surely, 2^654172539 is an apocalyptic number.

654172539 is a deficient number, since it is larger than the sum of its proper divisors (218057517).

654172539 is a wasteful number, since it uses less digits than its factorization.

654172539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218057516.

The product of its digits is 226800, while the sum is 42.

The square root of 654172539 is about 25576.7968870224. The cubic root of 654172539 is about 868.0887001705.

The spelling of 654172539 in words is "six hundred fifty-four million, one hundred seventy-two thousand, five hundred thirty-nine".