51022731 has 4 divisors (see below), whose sum is σ = 68030312. Its totient is φ = 34015152.

The previous prime is 51022691. The next prime is 51022739. The reversal of 51022731 is 13722015.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51022731 - 2⁷ = 51022603 is a prime.

It is a super-2 number, since 2×51022731² = 5206638157396722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51022698 and 51022707.

It is not an unprimeable number, because it can be changed into a prime (51022739) 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, 8503786 + ... + 8503791.

It is an arithmetic number, because the mean of its divisors is an integer number (17007578).

Almost surely, 2^51022731 is an apocalyptic number.

51022731 is a deficient number, since it is larger than the sum of its proper divisors (17007581).

51022731 is a wasteful number, since it uses less digits than its factorization.

51022731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17007580.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 51022731 is about 7143.0197395779. The cubic root of 51022731 is about 370.8980643752.

Adding to 51022731 its reverse (13722015), we get a palindrome (64744746).

The spelling of 51022731 in words is "fifty-one million, twenty-two thousand, seven hundred thirty-one".