20310132991 has 2 divisors, whose sum is σ = 20310132992. Its totient is φ = 20310132990.

The previous prime is 20310132967. The next prime is 20310133001. The reversal of 20310132991 is 19923101302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20310132991 - 2⁵ = 20310132959 is a prime.

It is a super-2 number, since 2×20310132991² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20310132961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155066495 + 10155066496.

It is an arithmetic number, because the mean of its divisors is an integer number (10155066496).

Almost surely, 2^20310132991 is an apocalyptic number.

20310132991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20310132991 is an equidigital number, since it uses as much as digits as its factorization.

20310132991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 31.

The spelling of 20310132991 in words is "twenty billion, three hundred ten million, one hundred thirty-two thousand, nine hundred ninety-one".