1312240451 has 4 divisors (see below), whose sum is σ = 1312749504. Its totient is φ = 1311731400.

The previous prime is 1312240441. The next prime is 1312240469. The reversal of 1312240451 is 1540422131.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312240451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312240441) 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, 250640 + ... + 255821.

It is an arithmetic number, because the mean of its divisors is an integer number (328187376).

Almost surely, 2^1312240451 is an apocalyptic number.

1312240451 is a deficient number, since it is larger than the sum of its proper divisors (509053).

1312240451 is an equidigital number, since it uses as much as digits as its factorization.

1312240451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509052.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1312240451 is about 36224.8595718465. The cubic root of 1312240451 is about 1094.8076087974.

Adding to 1312240451 its reverse (1540422131), we get a palindrome (2852662582).

The spelling of 1312240451 in words is "one billion, three hundred twelve million, two hundred forty thousand, four hundred fifty-one".