51308031 has 8 divisors (see below), whose sum is σ = 68506240. Its totient is φ = 34157592.

The previous prime is 51308029. The next prime is 51308039. The reversal of 51308031 is 13080315.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51308031 - 2¹ = 51308029 is a prime.

It is a super-2 number, since 2×51308031² = 5265028090193922, 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 = 51307989 and 51308007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51308039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9355 + ... + 13788.

It is an arithmetic number, because the mean of its divisors is an integer number (8563280).

Almost surely, 2^51308031 is an apocalyptic number.

51308031 is a deficient number, since it is larger than the sum of its proper divisors (17198209).

51308031 is a wasteful number, since it uses less digits than its factorization.

51308031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23885.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 51308031 is about 7162.9624458041. The cubic root of 51308031 is about 371.5880875344.

Adding to 51308031 its reverse (13080315), we get a palindrome (64388346).

The spelling of 51308031 in words is "fifty-one million, three hundred eight thousand, thirty-one".