257363621 has 2 divisors, whose sum is σ = 257363622. Its totient is φ = 257363620.

The previous prime is 257363611. The next prime is 257363651. The reversal of 257363621 is 126363752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231496225 + 25867396 = 15215^2 + 5086^2 .

It is a cyclic number.

It is not a de Polignac number, because 257363621 - 2¹⁰ = 257362597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257363611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128681810 + 128681811.

It is an arithmetic number, because the mean of its divisors is an integer number (128681811).

Almost surely, 2^257363621 is an apocalyptic number.

It is an amenable number.

257363621 is a deficient number, since it is larger than the sum of its proper divisors (1).

257363621 is an equidigital number, since it uses as much as digits as its factorization.

257363621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 35.

The square root of 257363621 is about 16042.5565605984. The cubic root of 257363621 is about 636.0858277497.

The spelling of 257363621 in words is "two hundred fifty-seven million, three hundred sixty-three thousand, six hundred twenty-one".