1251315451 has 4 divisors (see below), whose sum is σ = 1277939232. Its totient is φ = 1224691672.

The previous prime is 1251315371. The next prime is 1251315463. The reversal of 1251315451 is 1545131521.

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 1251315451 - 2¹¹ = 1251313403 is a prime.

It is a super-2 number, since 2×1251315451² = 3131580715822666802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251315491) 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, 13311820 + ... + 13311913.

It is an arithmetic number, because the mean of its divisors is an integer number (319484808).

Almost surely, 2^1251315451 is an apocalyptic number.

1251315451 is a deficient number, since it is larger than the sum of its proper divisors (26623781).

1251315451 is an equidigital number, since it uses as much as digits as its factorization.

1251315451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26623780.

The product of its digits is 3000, while the sum is 28.

The square root of 1251315451 is about 35373.9374540070. The cubic root of 1251315451 is about 1077.5950863092.

Adding to 1251315451 its reverse (1545131521), we get a palindrome (2796446972).

The spelling of 1251315451 in words is "one billion, two hundred fifty-one million, three hundred fifteen thousand, four hundred fifty-one".