531978789631 has 2 divisors, whose sum is σ = 531978789632. Its totient is φ = 531978789630.

The previous prime is 531978789613. The next prime is 531978789649. The reversal of 531978789631 is 136987879135.

It is a happy number.

Together with previous prime (531978789613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (531978789613) and next prime (531978789649).

It is a cyclic number.

It is not a de Polignac number, because 531978789631 - 2²¹ = 531976692479 is a prime.

It is a super-2 number, since 2×531978789631² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531978789931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265989394815 + 265989394816.

It is an arithmetic number, because the mean of its divisors is an integer number (265989394816).

Almost surely, 2^531978789631 is an apocalyptic number.

531978789631 is a deficient number, since it is larger than the sum of its proper divisors (1).

531978789631 is an equidigital number, since it uses as much as digits as its factorization.

531978789631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68584320, while the sum is 67.

The spelling of 531978789631 in words is "five hundred thirty-one billion, nine hundred seventy-eight million, seven hundred eighty-nine thousand, six hundred thirty-one".