1251279315 has 96 divisors (see below), whose sum is σ = 2560049856. Its totient is φ = 557383680.

The previous prime is 1251279313. The next prime is 1251279347. The reversal of 1251279315 is 5139721521.

It is not a de Polignac number, because 1251279315 - 2¹ = 1251279313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1251279315.

It is not an unprimeable number, because it can be changed into a prime (1251279313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2168307 + ... + 2168883.

It is an arithmetic number, because the mean of its divisors is an integer number (26667186).

Almost surely, 2^1251279315 is an apocalyptic number.

1251279315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1251279315 is an abundant number, since it is smaller than the sum of its proper divisors (1308770541).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1251279315 is a wasteful number, since it uses less digits than its factorization.

1251279315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949 (or 946 counting only the distinct ones).

The product of its digits is 18900, while the sum is 36.

The square root of 1251279315 is about 35373.4266787938. The cubic root of 1251279315 is about 1077.5847131320.

The spelling of 1251279315 in words is "one billion, two hundred fifty-one million, two hundred seventy-nine thousand, three hundred fifteen".