431906693 has 2 divisors, whose sum is σ = 431906694. Its totient is φ = 431906692.

The previous prime is 431906681. The next prime is 431906701. The reversal of 431906693 is 396609134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 373185124 + 58721569 = 19318^2 + 7663^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431906693 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 431906693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431906633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215953346 + 215953347.

It is an arithmetic number, because the mean of its divisors is an integer number (215953347).

Almost surely, 2^431906693 is an apocalyptic number.

It is an amenable number.

431906693 is a deficient number, since it is larger than the sum of its proper divisors (1).

431906693 is an equidigital number, since it uses as much as digits as its factorization.

431906693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 431906693 is about 20782.3649520453. The cubic root of 431906693 is about 755.8982003451.

The spelling of 431906693 in words is "four hundred thirty-one million, nine hundred six thousand, six hundred ninety-three".