5156721 has 6 divisors (see below), whose sum is σ = 7448610. Its totient is φ = 3437808.

The previous prime is 5156719. The next prime is 5156731. The reversal of 5156721 is 1276515.

It can be written as a sum of positive squares in only one way, i.e., 3629025 + 1527696 = 1905^2 + 1236^2 .

It is not a de Polignac number, because 5156721 - 2¹ = 5156719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5156731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 286476 + ... + 286493.

It is an arithmetic number, because the mean of its divisors is an integer number (1241435).

Almost surely, 2^5156721 is an apocalyptic number.

It is an amenable number.

5156721 is a deficient number, since it is larger than the sum of its proper divisors (2291889).

5156721 is a wasteful number, since it uses less digits than its factorization.

5156721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572975 (or 572972 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 5156721 is about 2270.8414739915. The cubic root of 5156721 is about 172.7658408880.

The spelling of 5156721 in words is "five million, one hundred fifty-six thousand, seven hundred twenty-one".