1312245251 has 4 divisors (see below), whose sum is σ = 1312405392. Its totient is φ = 1312085112.

The previous prime is 1312245239. The next prime is 1312245257. The reversal of 1312245251 is 1525422131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1525422131 = 5281 ⋅288851.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312245251 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 1312245251.

It is not an unprimeable number, because it can be changed into a prime (1312245257) 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, 67076 + ... + 84401.

It is an arithmetic number, because the mean of its divisors is an integer number (328101348).

Almost surely, 2^1312245251 is an apocalyptic number.

1312245251 is a deficient number, since it is larger than the sum of its proper divisors (160141).

1312245251 is an equidigital number, since it uses as much as digits as its factorization.

1312245251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160140.

The product of its digits is 2400, while the sum is 26.

The square root of 1312245251 is about 36224.9258246308. The cubic root of 1312245251 is about 1094.8089436824.

Adding to 1312245251 its reverse (1525422131), we get a palindrome (2837667382).

The spelling of 1312245251 in words is "one billion, three hundred twelve million, two hundred forty-five thousand, two hundred fifty-one".