51242331 has 8 divisors (see below), whose sum is σ = 78083584. Its totient is φ = 29281320.

The previous prime is 51242311. The next prime is 51242339. The reversal of 51242331 is 13324215.

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

It is not a de Polignac number, because 51242331 - 2⁹ = 51241819 is a prime.

It is a super-2 number, since 2×51242331² = 5251552972627122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 2440111 = 51242331 / (5 + 1 + 2 + 4 + 2 + 3 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51242298 and 51242307.

It is not an unprimeable number, because it can be changed into a prime (51242339) 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, 1220035 + ... + 1220076.

It is an arithmetic number, because the mean of its divisors is an integer number (9760448).

Almost surely, 2^51242331 is an apocalyptic number.

51242331 is a deficient number, since it is larger than the sum of its proper divisors (26841253).

51242331 is a wasteful number, since it uses less digits than its factorization.

51242331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2440121.

The product of its digits is 720, while the sum is 21.

The square root of 51242331 is about 7158.3748854052. The cubic root of 51242331 is about 371.4294134455.

Adding to 51242331 its reverse (13324215), we get a palindrome (64566546).

The spelling of 51242331 in words is "fifty-one million, two hundred forty-two thousand, three hundred thirty-one".