83931887731 has 2 divisors, whose sum is σ = 83931887732. Its totient is φ = 83931887730.

The previous prime is 83931887713. The next prime is 83931887759. The reversal of 83931887731 is 13778813938.

Together with previous prime (83931887713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 83931887731 - 2⁹ = 83931887219 is a prime.

It is a super-2 number, since 2×83931887731² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (83931884731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41965943865 + 41965943866.

It is an arithmetic number, because the mean of its divisors is an integer number (41965943866).

Almost surely, 2^83931887731 is an apocalyptic number.

83931887731 is a deficient number, since it is larger than the sum of its proper divisors (1).

83931887731 is an equidigital number, since it uses as much as digits as its factorization.

83931887731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6096384, while the sum is 58.

The spelling of 83931887731 in words is "eighty-three billion, nine hundred thirty-one million, eight hundred eighty-seven thousand, seven hundred thirty-one".