431387069 has 2 divisors, whose sum is σ = 431387070. Its totient is φ = 431387068.

The previous prime is 431387029. The next prime is 431387083. The reversal of 431387069 is 960783134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 423824569 + 7562500 = 20587^2 + 2750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431387069 is a prime.

It is a super-2 number, since 2×431387069² = 372189606600821522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431387029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215693534 + 215693535.

It is an arithmetic number, because the mean of its divisors is an integer number (215693535).

Almost surely, 2^431387069 is an apocalyptic number.

It is an amenable number.

431387069 is a deficient number, since it is larger than the sum of its proper divisors (1).

431387069 is an equidigital number, since it uses as much as digits as its factorization.

431387069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 431387069 is about 20769.8596287987. The cubic root of 431387069 is about 755.5949400374.

The spelling of 431387069 in words is "four hundred thirty-one million, three hundred eighty-seven thousand, sixty-nine".