51142540531 has 4 divisors (see below), whose sum is σ = 51843123352. Its totient is φ = 50441957712.

The previous prime is 51142540513. The next prime is 51142540609. The reversal of 51142540531 is 13504524115.

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 51142540531 - 2⁵ = 51142540499 is a prime.

It is a super-2 number, since 2×51142540531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51142540493 and 51142540502.

It is not an unprimeable number, because it can be changed into a prime (51142540511) 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, 350291301 + ... + 350291446.

It is an arithmetic number, because the mean of its divisors is an integer number (12960780838).

Almost surely, 2^51142540531 is an apocalyptic number.

51142540531 is a deficient number, since it is larger than the sum of its proper divisors (700582821).

51142540531 is an equidigital number, since it uses as much as digits as its factorization.

51142540531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700582820.

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 51142540531 in words is "fifty-one billion, one hundred forty-two million, five hundred forty thousand, five hundred thirty-one".