51286531 has 8 divisors (see below), whose sum is σ = 52835328. Its totient is φ = 49752000.

The previous prime is 51286523. The next prime is 51286559. The reversal of 51286531 is 13568215.

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 51286531 - 2³ = 51286523 is a prime.

It is a super-2 number, since 2×51286531² = 5260616524027922, 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 = 51286493 and 51286502.

It is not an unprimeable number, because it can be changed into a prime (51286511) 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, 3966 + ... + 10876.

It is an arithmetic number, because the mean of its divisors is an integer number (6604416).

Almost surely, 2^51286531 is an apocalyptic number.

51286531 is a deficient number, since it is larger than the sum of its proper divisors (1548797).

51286531 is a wasteful number, since it uses less digits than its factorization.

51286531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7133.

The product of its digits is 7200, while the sum is 31.

The square root of 51286531 is about 7161.4615128478. The cubic root of 51286531 is about 371.5361771420.

The spelling of 51286531 in words is "fifty-one million, two hundred eighty-six thousand, five hundred thirty-one".