1215641615 has 8 divisors (see below), whose sum is σ = 1459058640. Its totient is φ = 972320832.

The previous prime is 1215641569. The next prime is 1215641621. The reversal of 1215641615 is 5161465121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1215641615 - 2⁶ = 1215641551 is a prime.

It is a super-2 number, since 2×1215641615² = 2955569072239616450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7496 + ... + 49874.

It is an arithmetic number, because the mean of its divisors is an integer number (182382330).

Almost surely, 2^1215641615 is an apocalyptic number.

1215641615 is a deficient number, since it is larger than the sum of its proper divisors (243417025).

1215641615 is an equidigital number, since it uses as much as digits as its factorization.

1215641615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48121.

The product of its digits is 7200, while the sum is 32.

The square root of 1215641615 is about 34866.0524722831. The cubic root of 1215641615 is about 1067.2557900710.

The spelling of 1215641615 in words is "one billion, two hundred fifteen million, six hundred forty-one thousand, six hundred fifteen".