431540639 has 2 divisors, whose sum is σ = 431540640. Its totient is φ = 431540638.

The previous prime is 431540633. The next prime is 431540687. The reversal of 431540639 is 936045134.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 431540639 - 2²⁸ = 163105183 is a prime.

It is a super-3 number, since 3×431540639³ (a number of 27 digits) contains 333 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 431540599 and 431540608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431540633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215770319 + 215770320.

It is an arithmetic number, because the mean of its divisors is an integer number (215770320).

Almost surely, 2^431540639 is an apocalyptic number.

431540639 is a deficient number, since it is larger than the sum of its proper divisors (1).

431540639 is an equidigital number, since it uses as much as digits as its factorization.

431540639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 431540639 is about 20773.5562434553. The cubic root of 431540639 is about 755.6845911161.

The spelling of 431540639 in words is "four hundred thirty-one million, five hundred forty thousand, six hundred thirty-nine".