51451431 has 4 divisors (see below), whose sum is σ = 68601912. Its totient is φ = 34300952.

The previous prime is 51451427. The next prime is 51451441. The reversal of 51451431 is 13415415.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 51451431 - 2² = 51451427 is a prime.

It is a super-2 number, since 2×51451431² = 5294499503895522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51451441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8575236 + ... + 8575241.

It is an arithmetic number, because the mean of its divisors is an integer number (17150478).

Almost surely, 2^51451431 is an apocalyptic number.

51451431 is a deficient number, since it is larger than the sum of its proper divisors (17150481).

51451431 is a wasteful number, since it uses less digits than its factorization.

51451431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17150480.

The product of its digits is 1200, while the sum is 24.

The square root of 51451431 is about 7172.9652864070. The cubic root of 51451431 is about 371.9339474006.

Adding to 51451431 its reverse (13415415), we get a palindrome (64866846).

The spelling of 51451431 in words is "fifty-one million, four hundred fifty-one thousand, four hundred thirty-one".