1313320251 has 4 divisors (see below), whose sum is σ = 1751093672. Its totient is φ = 875546832.

The previous prime is 1313320249. The next prime is 1313320259. The reversal of 1313320251 is 1520233131.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1313320251 - 2¹ = 1313320249 is a prime.

It is a super-3 number, since 3×1313320251³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1313320259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218886706 + ... + 218886711.

It is an arithmetic number, because the mean of its divisors is an integer number (437773418).

Almost surely, 2^1313320251 is an apocalyptic number.

1313320251 is a deficient number, since it is larger than the sum of its proper divisors (437773421).

1313320251 is an equidigital number, since it uses as much as digits as its factorization.

1313320251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437773420.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 1313320251 is about 36239.7606366267. The cubic root of 1313320251 is about 1095.1078203290.

Adding to 1313320251 its reverse (1520233131), we get a palindrome (2833553382).

The spelling of 1313320251 in words is "one billion, three hundred thirteen million, three hundred twenty thousand, two hundred fifty-one".