431236397 has 2 divisors, whose sum is σ = 431236398. Its totient is φ = 431236396.

The previous prime is 431236357. The next prime is 431236423. The reversal of 431236397 is 793632134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 424112836 + 7123561 = 20594^2 + 2669^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431236397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 431236397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431236357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215618198 + 215618199.

It is an arithmetic number, because the mean of its divisors is an integer number (215618199).

Almost surely, 2^431236397 is an apocalyptic number.

It is an amenable number.

431236397 is a deficient number, since it is larger than the sum of its proper divisors (1).

431236397 is an equidigital number, since it uses as much as digits as its factorization.

431236397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 38.

The square root of 431236397 is about 20766.2321329605. The cubic root of 431236397 is about 755.5069600722.

The spelling of 431236397 in words is "four hundred thirty-one million, two hundred thirty-six thousand, three hundred ninety-seven".