257633197 has 2 divisors, whose sum is σ = 257633198. Its totient is φ = 257633196.

The previous prime is 257633153. The next prime is 257633213. The reversal of 257633197 is 791336752.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222278281 + 35354916 = 14909^2 + 5946^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257633197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257633137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128816598 + 128816599.

It is an arithmetic number, because the mean of its divisors is an integer number (128816599).

Almost surely, 2^257633197 is an apocalyptic number.

It is an amenable number.

257633197 is a deficient number, since it is larger than the sum of its proper divisors (1).

257633197 is an equidigital number, since it uses as much as digits as its factorization.

257633197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 238140, while the sum is 43.

The square root of 257633197 is about 16050.9562643476. The cubic root of 257633197 is about 636.3078400102.

The spelling of 257633197 in words is "two hundred fifty-seven million, six hundred thirty-three thousand, one hundred ninety-seven".