51442431 has 8 divisors (see below), whose sum is σ = 69269424. Its totient is φ = 33955200.

The previous prime is 51442429. The next prime is 51442451. The reversal of 51442431 is 13424415.

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

It is not a de Polignac number, because 51442431 - 2¹ = 51442429 is a prime.

It is a super-2 number, since 2×51442431² = 5292647414379522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51442451) 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, 84586 + ... + 85191.

It is an arithmetic number, because the mean of its divisors is an integer number (8658678).

Almost surely, 2^51442431 is an apocalyptic number.

51442431 is a deficient number, since it is larger than the sum of its proper divisors (17826993).

51442431 is a wasteful number, since it uses less digits than its factorization.

51442431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169881.

The product of its digits is 1920, while the sum is 24.

The square root of 51442431 is about 7172.3379033618. The cubic root of 51442431 is about 371.9122596285.

Adding to 51442431 its reverse (13424415), we get a palindrome (64866846).

The spelling of 51442431 in words is "fifty-one million, four hundred forty-two thousand, four hundred thirty-one".