431660197 has 2 divisors, whose sum is σ = 431660198. Its totient is φ = 431660196.

The previous prime is 431660147. The next prime is 431660219. The reversal of 431660197 is 791066134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 411643521 + 20016676 = 20289^2 + 4474^2 .

It is a cyclic number.

It is not a de Polignac number, because 431660197 - 2¹⁵ = 431627429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431660137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215830098 + 215830099.

It is an arithmetic number, because the mean of its divisors is an integer number (215830099).

Almost surely, 2^431660197 is an apocalyptic number.

It is an amenable number.

431660197 is a deficient number, since it is larger than the sum of its proper divisors (1).

431660197 is an equidigital number, since it uses as much as digits as its factorization.

431660197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 431660197 is about 20776.4336930090. The cubic root of 431660197 is about 755.7543719493.

The spelling of 431660197 in words is "four hundred thirty-one million, six hundred sixty thousand, one hundred ninety-seven".