51240531 has 4 divisors (see below), whose sum is σ = 68320712. Its totient is φ = 34160352.

The previous prime is 51240493. The next prime is 51240547. The reversal of 51240531 is 13504215.

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

It is not a de Polignac number, because 51240531 - 2⁶ = 51240467 is a prime.

It is a super-2 number, since 2×51240531² = 5251184034323922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51240498 and 51240507.

It is not an unprimeable number, because it can be changed into a prime (51240571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8540086 + ... + 8540091.

It is an arithmetic number, because the mean of its divisors is an integer number (17080178).

Almost surely, 2^51240531 is an apocalyptic number.

51240531 is a deficient number, since it is larger than the sum of its proper divisors (17080181).

51240531 is a wasteful number, since it uses less digits than its factorization.

51240531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17080180.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 51240531 is about 7158.2491574407. The cubic root of 51240531 is about 371.4250643019.

Adding to 51240531 its reverse (13504215), we get a palindrome (64744746).

The spelling of 51240531 in words is "fifty-one million, two hundred forty thousand, five hundred thirty-one".