657321149 has 2 divisors, whose sum is σ = 657321150. Its totient is φ = 657321148.

The previous prime is 657321043. The next prime is 657321157. The reversal of 657321149 is 941123756.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 611325625 + 45995524 = 24725^2 + 6782^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-657321149 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (657321199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328660574 + 328660575.

It is an arithmetic number, because the mean of its divisors is an integer number (328660575).

Almost surely, 2^657321149 is an apocalyptic number.

It is an amenable number.

657321149 is a deficient number, since it is larger than the sum of its proper divisors (1).

657321149 is an equidigital number, since it uses as much as digits as its factorization.

657321149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 38.

The square root of 657321149 is about 25638.2750784837. The cubic root of 657321149 is about 869.4792096050.

The spelling of 657321149 in words is "six hundred fifty-seven million, three hundred twenty-one thousand, one hundred forty-nine".