51206431 has 8 divisors (see below), whose sum is σ = 56088720. Its totient is φ = 46531968.

The previous prime is 51206429. The next prime is 51206447. The reversal of 51206431 is 13460215.

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

It is a cyclic number.

It is not a de Polignac number, because 51206431 - 2¹ = 51206429 is a prime.

It is a super-2 number, since 2×51206431² = 5244197151515522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51206471) 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, 51441 + ... + 52426.

It is an arithmetic number, because the mean of its divisors is an integer number (7011090).

Almost surely, 2^51206431 is an apocalyptic number.

51206431 is a deficient number, since it is larger than the sum of its proper divisors (4882289).

51206431 is a wasteful number, since it uses less digits than its factorization.

51206431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103913.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 51206431 is about 7155.8668936754. The cubic root of 51206431 is about 371.3426529432.

Adding to 51206431 its reverse (13460215), we get a palindrome (64666646).

The spelling of 51206431 in words is "fifty-one million, two hundred six thousand, four hundred thirty-one".