931387661563 has 2 divisors, whose sum is σ = 931387661564. Its totient is φ = 931387661562.

The previous prime is 931387661549. The next prime is 931387661569. The reversal of 931387661563 is 365166783139.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 931387661563 - 2⁹ = 931387661051 is a prime.

It is a super-2 number, since 2×931387661563² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 931387661498 and 931387661507.

It is not a weakly prime, because it can be changed into another prime (931387661569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 465693830781 + 465693830782.

It is an arithmetic number, because the mean of its divisors is an integer number (465693830782).

Almost surely, 2^931387661563 is an apocalyptic number.

931387661563 is a deficient number, since it is larger than the sum of its proper divisors (1).

931387661563 is an equidigital number, since it uses as much as digits as its factorization.

931387661563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14696640, while the sum is 58.

The spelling of 931387661563 in words is "nine hundred thirty-one billion, three hundred eighty-seven million, six hundred sixty-one thousand, five hundred sixty-three".