51407531 has 8 divisors (see below), whose sum is σ = 58817280. Its totient is φ = 44014248.

The previous prime is 51407527. The next prime is 51407537. The reversal of 51407531 is 13570415.

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 51407531 - 2² = 51407527 is a prime.

It is a super-2 number, since 2×51407531² = 5285468487031922, 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 51407531.

It is not an unprimeable number, because it can be changed into a prime (51407537) 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, 3530 + ... + 10736.

It is an arithmetic number, because the mean of its divisors is an integer number (7352160).

Almost surely, 2^51407531 is an apocalyptic number.

51407531 is a deficient number, since it is larger than the sum of its proper divisors (7409749).

51407531 is a wasteful number, since it uses less digits than its factorization.

51407531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8233.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 51407531 is about 7169.9045321399. The cubic root of 51407531 is about 371.8281353366.

Adding to 51407531 its reverse (13570415), we get a palindrome (64977946).

The spelling of 51407531 in words is "fifty-one million, four hundred seven thousand, five hundred thirty-one".