5156527721 has 4 divisors (see below), whose sum is σ = 5229154944. Its totient is φ = 5083900500.

The previous prime is 5156527709. The next prime is 5156527751. The reversal of 5156527721 is 1277256515.

It is a happy number.

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 5156527721 - 2¹⁴ = 5156511337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5156527751) 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, 36313505 + ... + 36313646.

It is an arithmetic number, because the mean of its divisors is an integer number (1307288736).

Almost surely, 2^5156527721 is an apocalyptic number.

It is an amenable number.

5156527721 is a deficient number, since it is larger than the sum of its proper divisors (72627223).

5156527721 is an equidigital number, since it uses as much as digits as its factorization.

5156527721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72627222.

The product of its digits is 147000, while the sum is 41.

The square root of 5156527721 is about 71808.9668565145. The cubic root of 5156527721 is about 1727.6368238292.

The spelling of 5156527721 in words is "five billion, one hundred fifty-six million, five hundred twenty-seven thousand, seven hundred twenty-one".