56172749 has 4 divisors (see below), whose sum is σ = 57479136. Its totient is φ = 54866364.

The previous prime is 56172737. The next prime is 56172751. The reversal of 56172749 is 94727165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56172749 - 2²⁴ = 39395533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56172719) 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, 653129 + ... + 653214.

It is an arithmetic number, because the mean of its divisors is an integer number (14369784).

Almost surely, 2^56172749 is an apocalyptic number.

It is an amenable number.

56172749 is a deficient number, since it is larger than the sum of its proper divisors (1306387).

56172749 is a wasteful number, since it uses less digits than its factorization.

56172749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1306386.

The product of its digits is 105840, while the sum is 41.

The square root of 56172749 is about 7494.8481639057. The cubic root of 56172749 is about 382.9792338542.

The spelling of 56172749 in words is "fifty-six million, one hundred seventy-two thousand, seven hundred forty-nine".