5131656381 has 4 divisors (see below), whose sum is σ = 6842208512. Its totient is φ = 3421104252.

The previous prime is 5131656377. The next prime is 5131656389. The reversal of 5131656381 is 1836561315.

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 5131656381 - 2² = 5131656377 is a prime.

It is a super-2 number, since 2×5131656381² = 52667794425316034322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5131656389) 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, 855276061 + ... + 855276066.

It is an arithmetic number, because the mean of its divisors is an integer number (1710552128).

Almost surely, 2^5131656381 is an apocalyptic number.

It is an amenable number.

5131656381 is a deficient number, since it is larger than the sum of its proper divisors (1710552131).

5131656381 is a wasteful number, since it uses less digits than its factorization.

5131656381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710552130.

The product of its digits is 64800, while the sum is 39.

The square root of 5131656381 is about 71635.5804122504. The cubic root of 5131656381 is about 1724.8547248377.

The spelling of 5131656381 in words is "five billion, one hundred thirty-one million, six hundred fifty-six thousand, three hundred eighty-one".