20131023091 has 2 divisors, whose sum is σ = 20131023092. Its totient is φ = 20131023090.

The previous prime is 20131023043. The next prime is 20131023103. The reversal of 20131023091 is 19032013102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20131023091 - 2⁷ = 20131022963 is a prime.

It is not a weakly prime, because it can be changed into another prime (20131023391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10065511545 + 10065511546.

It is an arithmetic number, because the mean of its divisors is an integer number (10065511546).

Almost surely, 2^20131023091 is an apocalyptic number.

20131023091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20131023091 is an equidigital number, since it uses as much as digits as its factorization.

20131023091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 20131023091 its reverse (19032013102), we get a palindrome (39163036193).

The spelling of 20131023091 in words is "twenty billion, one hundred thirty-one million, twenty-three thousand, ninety-one".