5156444721 has 4 divisors (see below), whose sum is σ = 6875259632. Its totient is φ = 3437629812.

The previous prime is 5156444701. The next prime is 5156444723. The reversal of 5156444721 is 1274446515.

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 not a de Polignac number, because 5156444721 - 2⁷ = 5156444593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5156444721.

It is not an unprimeable number, because it can be changed into a prime (5156444723) 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, 859407451 + ... + 859407456.

It is an arithmetic number, because the mean of its divisors is an integer number (1718814908).

Almost surely, 2^5156444721 is an apocalyptic number.

It is an amenable number.

5156444721 is a deficient number, since it is larger than the sum of its proper divisors (1718814911).

5156444721 is a wasteful number, since it uses less digits than its factorization.

5156444721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718814910.

The product of its digits is 134400, while the sum is 39.

The square root of 5156444721 is about 71808.3889319347. The cubic root of 5156444721 is about 1727.6275543728.

The spelling of 5156444721 in words is "five billion, one hundred fifty-six million, four hundred forty-four thousand, seven hundred twenty-one".