1308741257 has 4 divisors (see below), whose sum is σ = 1312158720. Its totient is φ = 1305323796.

The previous prime is 1308741233. The next prime is 1308741263. The reversal of 1308741257 is 7521478031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7521478031 = 163 ⋅46144037.

It is a cyclic number.

It is not a de Polignac number, because 1308741257 - 2¹⁰ = 1308740233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1308741257.

It is not an unprimeable number, because it can be changed into a prime (1308741227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1708157 + ... + 1708922.

It is an arithmetic number, because the mean of its divisors is an integer number (328039680).

Almost surely, 2^1308741257 is an apocalyptic number.

It is an amenable number.

1308741257 is a deficient number, since it is larger than the sum of its proper divisors (3417463).

1308741257 is an equidigital number, since it uses as much as digits as its factorization.

1308741257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3417462.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 1308741257 is about 36176.5290900053. The cubic root of 1308741257 is about 1093.8336118851.

The spelling of 1308741257 in words is "one billion, three hundred eight million, seven hundred forty-one thousand, two hundred fifty-seven".