1313205257 has 8 divisors (see below), whose sum is σ = 1616252736. Its totient is φ = 1039019472.

The previous prime is 1313205253. The next prime is 1313205259. The reversal of 1313205257 is 7525023131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1313205257 - 2² = 1313205253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1313205253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7215323 + ... + 7215504.

It is an arithmetic number, because the mean of its divisors is an integer number (202031592).

Almost surely, 2^1313205257 is an apocalyptic number.

It is an amenable number.

1313205257 is a deficient number, since it is larger than the sum of its proper divisors (303047479).

1313205257 is a wasteful number, since it uses less digits than its factorization.

1313205257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14430847.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 1313205257 is about 36238.1740296059. The cubic root of 1313205257 is about 1095.0758569384.

Adding to 1313205257 its reverse (7525023131), we get a palindrome (8838228388).

The spelling of 1313205257 in words is "one billion, three hundred thirteen million, two hundred five thousand, two hundred fifty-seven".