51402403531 has 2 divisors, whose sum is σ = 51402403532. Its totient is φ = 51402403530.

The previous prime is 51402403529. The next prime is 51402403541. The reversal of 51402403531 is 13530420415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51402403531 - 2¹ = 51402403529 is a prime.

It is a super-2 number, since 2×51402403531² (a number of 22 digits) contains 22 as substring.

Together with 51402403529, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 51402403531.

It is not a weakly prime, because it can be changed into another prime (51402403541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25701201765 + 25701201766.

It is an arithmetic number, because the mean of its divisors is an integer number (25701201766).

Almost surely, 2^51402403531 is an apocalyptic number.

51402403531 is a deficient number, since it is larger than the sum of its proper divisors (1).

51402403531 is an equidigital number, since it uses as much as digits as its factorization.

51402403531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 51402403531 its reverse (13530420415), we get a palindrome (64932823946).

The spelling of 51402403531 in words is "fifty-one billion, four hundred two million, four hundred three thousand, five hundred thirty-one".