1251265215 has 16 divisors (see below), whose sum is σ = 2035958400. Its totient is φ = 656030112.

The previous prime is 1251265207. The next prime is 1251265219. The reversal of 1251265215 is 5125621521.

It is not a de Polignac number, because 1251265215 - 2³ = 1251265207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251265219) 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 15 ways as a sum of consecutive naturals, for example, 706045 + ... + 707814.

It is an arithmetic number, because the mean of its divisors is an integer number (127247400).

Almost surely, 2^1251265215 is an apocalyptic number.

1251265215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1251265215 is a deficient number, since it is larger than the sum of its proper divisors (784693185).

1251265215 is a wasteful number, since it uses less digits than its factorization.

1251265215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1413926.

The product of its digits is 6000, while the sum is 30.

The square root of 1251265215 is about 35373.2273760820. The cubic root of 1251265215 is about 1077.5806655407.

Adding to 1251265215 its reverse (5125621521), we get a palindrome (6376886736).

The spelling of 1251265215 in words is "one billion, two hundred fifty-one million, two hundred sixty-five thousand, two hundred fifteen".