213130231991 has 2 divisors, whose sum is σ = 213130231992. Its totient is φ = 213130231990.

The previous prime is 213130231927. The next prime is 213130232011. The reversal of 213130231991 is 199132031312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213130231991 - 2⁶ = 213130231927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213130231921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106565115995 + 106565115996.

It is an arithmetic number, because the mean of its divisors is an integer number (106565115996).

Almost surely, 2^213130231991 is an apocalyptic number.

213130231991 is a deficient number, since it is larger than the sum of its proper divisors (1).

213130231991 is an equidigital number, since it uses as much as digits as its factorization.

213130231991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 35.

The spelling of 213130231991 in words is "two hundred thirteen billion, one hundred thirty million, two hundred thirty-one thousand, nine hundred ninety-one".