1251215355 has 16 divisors (see below), whose sum is σ = 2155940640. Its totient is φ = 615982848.

The previous prime is 1251215299. The next prime is 1251215447. The reversal of 1251215355 is 5535121521.

1251215355 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1251215355 - 2⁸ = 1251215099 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3208050 + ... + 3208439.

It is an arithmetic number, because the mean of its divisors is an integer number (134746290).

Almost surely, 2^1251215355 is an apocalyptic number.

1251215355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1251215355 is a deficient number, since it is larger than the sum of its proper divisors (904725285).

1251215355 is a wasteful number, since it uses less digits than its factorization.

1251215355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6416510.

The product of its digits is 7500, while the sum is 30.

The square root of 1251215355 is about 35372.5225987630. The cubic root of 1251215355 is about 1077.5663523253.

Adding to 1251215355 its reverse (5535121521), we get a palindrome (6786336876).

The spelling of 1251215355 in words is "one billion, two hundred fifty-one million, two hundred fifteen thousand, three hundred fifty-five".