431139997 has 2 divisors, whose sum is σ = 431139998. Its totient is φ = 431139996.

The previous prime is 431139979. The next prime is 431140027. The reversal of 431139997 is 799931134.

Together with previous prime (431139979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 412658596 + 18481401 = 20314^2 + 4299^2 .

It is a cyclic number.

It is not a de Polignac number, because 431139997 - 2²³ = 422751389 is a prime.

It is a super-4 number, since 4×431139997⁴ (a number of 36 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431139097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215569998 + 215569999.

It is an arithmetic number, because the mean of its divisors is an integer number (215569999).

Almost surely, 2^431139997 is an apocalyptic number.

It is an amenable number.

431139997 is a deficient number, since it is larger than the sum of its proper divisors (1).

431139997 is an equidigital number, since it uses as much as digits as its factorization.

431139997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183708, while the sum is 46.

The square root of 431139997 is about 20763.9109273759. The cubic root of 431139997 is about 755.4506597080.

The spelling of 431139997 in words is "four hundred thirty-one million, one hundred thirty-nine thousand, nine hundred ninety-seven".