1315211251 has 4 divisors (see below), whose sum is σ = 1318350600. Its totient is φ = 1312071904.

The previous prime is 1315211159. The next prime is 1315211279. The reversal of 1315211251 is 1521125131.

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

It is a cyclic number.

It is not a de Polignac number, because 1315211251 - 2¹³ = 1315203059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1315211291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1569046 + ... + 1569883.

It is an arithmetic number, because the mean of its divisors is an integer number (329587650).

Almost surely, 2^1315211251 is an apocalyptic number.

1315211251 is a deficient number, since it is larger than the sum of its proper divisors (3139349).

1315211251 is an equidigital number, since it uses as much as digits as its factorization.

1315211251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3139348.

The product of its digits is 300, while the sum is 22.

The square root of 1315211251 is about 36265.8413800094. The cubic root of 1315211251 is about 1095.6331696662.

Adding to 1315211251 its reverse (1521125131), we get a palindrome (2836336382).

The spelling of 1315211251 in words is "one billion, three hundred fifteen million, two hundred eleven thousand, two hundred fifty-one".