51323031 has 16 divisors (see below), whose sum is σ = 76428000. Its totient is φ = 34038144.

The previous prime is 51323029. The next prime is 51323071. The reversal of 51323031 is 13032315.

It is not a de Polignac number, because 51323031 - 2¹ = 51323029 is a prime.

It is a super-2 number, since 2×51323031² = 5268107022053922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51322995 and 51323013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51323071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 495 + ... + 10143.

It is an arithmetic number, because the mean of its divisors is an integer number (4776750).

Almost surely, 2^51323031 is an apocalyptic number.

51323031 is a deficient number, since it is larger than the sum of its proper divisors (25104969).

51323031 is a wasteful number, since it uses less digits than its factorization.

51323031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9855 (or 9849 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 51323031 is about 7164.0094221044. The cubic root of 51323031 is about 371.6242954997.

Adding to 51323031 its reverse (13032315), we get a palindrome (64355346).

The spelling of 51323031 in words is "fifty-one million, three hundred twenty-three thousand, thirty-one".