1251201215 has 16 divisors (see below), whose sum is σ = 1662387840. Its totient is φ = 896380320.

The previous prime is 1251201181. The next prime is 1251201227. The reversal of 1251201215 is 5121021521.

It is not a de Polignac number, because 1251201215 - 2¹² = 1251197119 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 166085 + ... + 173454.

It is an arithmetic number, because the mean of its divisors is an integer number (103899240).

Almost surely, 2^1251201215 is an apocalyptic number.

1251201215 is a deficient number, since it is larger than the sum of its proper divisors (411186625).

1251201215 is a wasteful number, since it uses less digits than its factorization.

1251201215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339622.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 1251201215 is about 35372.3227255435. The cubic root of 1251201215 is about 1077.5622931132.

Adding to 1251201215 its reverse (5121021521), we get a palindrome (6372222736).

The spelling of 1251201215 in words is "one billion, two hundred fifty-one million, two hundred one thousand, two hundred fifteen".