431986239691 has 2 divisors, whose sum is σ = 431986239692. Its totient is φ = 431986239690.

The previous prime is 431986239689. The next prime is 431986239761. The reversal of 431986239691 is 196932689134.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 431986239691 - 2¹ = 431986239689 is a prime.

It is a super-2 number, since 2×431986239691² (a number of 24 digits) contains 22 as substring.

Together with 431986239689, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (431986279691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215993119845 + 215993119846.

It is an arithmetic number, because the mean of its divisors is an integer number (215993119846).

Almost surely, 2^431986239691 is an apocalyptic number.

431986239691 is a deficient number, since it is larger than the sum of its proper divisors (1).

431986239691 is an equidigital number, since it uses as much as digits as its factorization.

431986239691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15116544, while the sum is 61.

The spelling of 431986239691 in words is "four hundred thirty-one billion, nine hundred eighty-six million, two hundred thirty-nine thousand, six hundred ninety-one".