51545431 has 8 divisors (see below), whose sum is σ = 59460480. Its totient is φ = 43768248.

The previous prime is 51545419. The next prime is 51545437. The reversal of 51545431 is 13454515.

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 51545431 - 2⁵ = 51545399 is a prime.

It is a super-2 number, since 2×51545431² = 5313862913951522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51545431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51545437) 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, 33661 + ... + 35158.

It is an arithmetic number, because the mean of its divisors is an integer number (7432560).

Almost surely, 2^51545431 is an apocalyptic number.

51545431 is a deficient number, since it is larger than the sum of its proper divisors (7915049).

51545431 is a wasteful number, since it uses less digits than its factorization.

51545431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68933.

The product of its digits is 6000, while the sum is 28.

The square root of 51545431 is about 7179.5146771909. The cubic root of 51545431 is about 372.1603131247.

Adding to 51545431 its reverse (13454515), we get a palindrome (64999946).

It can be divided in two parts, 5154 and 5431, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 51545431 in words is "fifty-one million, five hundred forty-five thousand, four hundred thirty-one".