212431263991 has 2 divisors, whose sum is σ = 212431263992. Its totient is φ = 212431263990.

The previous prime is 212431263983. The next prime is 212431264057. The reversal of 212431263991 is 199362134212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212431263991 - 2³ = 212431263983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212431263911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106215631995 + 106215631996.

It is an arithmetic number, because the mean of its divisors is an integer number (106215631996).

Almost surely, 2^212431263991 is an apocalyptic number.

212431263991 is a deficient number, since it is larger than the sum of its proper divisors (1).

212431263991 is an equidigital number, since it uses as much as digits as its factorization.

212431263991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 43.

The spelling of 212431263991 in words is "two hundred twelve billion, four hundred thirty-one million, two hundred sixty-three thousand, nine hundred ninety-one".