10101991931 has 2 divisors, whose sum is σ = 10101991932. Its totient is φ = 10101991930.

The previous prime is 10101991919. The next prime is 10101991937. The reversal of 10101991931 is 13919910101.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 10101991931 - 2¹⁴ = 10101975547 is a prime.

It is a super-2 number, since 2×10101991931² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10101991891 and 10101991900.

It is not a weakly prime, because it can be changed into another prime (10101991937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5050995965 + 5050995966.

It is an arithmetic number, because the mean of its divisors is an integer number (5050995966).

Almost surely, 2^10101991931 is an apocalyptic number.

10101991931 is a deficient number, since it is larger than the sum of its proper divisors (1).

10101991931 is an equidigital number, since it uses as much as digits as its factorization.

10101991931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2187, while the sum is 35.

The spelling of 10101991931 in words is "ten billion, one hundred one million, nine hundred ninety-one thousand, nine hundred thirty-one".