1215252153 has 20 divisors (see below), whose sum is σ = 1826267520. Its totient is φ = 805307832.

The previous prime is 1215252139. The next prime is 1215252169. The reversal of 1215252153 is 3512525121.

1215252153 is a `hidden beast` number, since 121 + 525 + 2 + 15 + 3 = 666.

It is not a de Polignac number, because 1215252153 - 2⁵ = 1215252121 is a prime.

It is a super-2 number, since 2×1215252153² = 2953675590742270818, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1215252133) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 31393 + ... + 58446.

It is an arithmetic number, because the mean of its divisors is an integer number (91313376).

Almost surely, 2^1215252153 is an apocalyptic number.

It is an amenable number.

1215252153 is a deficient number, since it is larger than the sum of its proper divisors (611015367).

1215252153 is an equidigital number, since it uses as much as digits as its factorization.

1215252153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90018 (or 90009 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 1215252153 is about 34860.4669073723. The cubic root of 1215252153 is about 1067.1418036335.

Adding to 1215252153 its reverse (3512525121), we get a palindrome (4727777274).

The spelling of 1215252153 in words is "one billion, two hundred fifteen million, two hundred fifty-two thousand, one hundred fifty-three".