653238857 has 2 divisors, whose sum is σ = 653238858. Its totient is φ = 653238856.

The previous prime is 653238799. The next prime is 653238899. The reversal of 653238857 is 758832356.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 638269696 + 14969161 = 25264^2 + 3869^2 .

It is a cyclic number.

It is not a de Polignac number, because 653238857 - 2¹⁰ = 653237833 is a prime.

It is not a weakly prime, because it can be changed into another prime (653231857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326619428 + 326619429.

It is an arithmetic number, because the mean of its divisors is an integer number (326619429).

Almost surely, 2^653238857 is an apocalyptic number.

It is an amenable number.

653238857 is a deficient number, since it is larger than the sum of its proper divisors (1).

653238857 is an equidigital number, since it uses as much as digits as its factorization.

653238857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1209600, while the sum is 47.

The square root of 653238857 is about 25558.5378494154. The cubic root of 653238857 is about 867.6755040274.

The spelling of 653238857 in words is "six hundred fifty-three million, two hundred thirty-eight thousand, eight hundred fifty-seven".