1657317449 has 2 divisors, whose sum is σ = 1657317450. Its totient is φ = 1657317448.

The previous prime is 1657317421. The next prime is 1657317461. The reversal of 1657317449 is 9447137561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1603441849 + 53875600 = 40043^2 + 7340^2 .

It is a cyclic number.

It is not a de Polignac number, because 1657317449 - 2²⁴ = 1640540233 is a prime.

It is a super-2 number, since 2×1657317449² = 5493402253519735202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1657317419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828658724 + 828658725.

It is an arithmetic number, because the mean of its divisors is an integer number (828658725).

Almost surely, 2^1657317449 is an apocalyptic number.

It is an amenable number.

1657317449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1657317449 is an equidigital number, since it uses as much as digits as its factorization.

1657317449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 47.

The square root of 1657317449 is about 40710.1639520157. The cubic root of 1657317449 is about 1183.4099985419.

The spelling of 1657317449 in words is "one billion, six hundred fifty-seven million, three hundred seventeen thousand, four hundred forty-nine".