1215681653 has 8 divisors (see below), whose sum is σ = 1258195680. Its totient is φ = 1173207280.

The previous prime is 1215681637. The next prime is 1215681659. The reversal of 1215681653 is 3561865121.

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 1215681653 - 2⁴ = 1215681637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215681659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61226 + ... + 78612.

It is an arithmetic number, because the mean of its divisors is an integer number (157274460).

Almost surely, 2^1215681653 is an apocalyptic number.

It is an amenable number.

1215681653 is a deficient number, since it is larger than the sum of its proper divisors (42514027).

1215681653 is a wasteful number, since it uses less digits than its factorization.

1215681653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19827.

The product of its digits is 43200, while the sum is 38.

The square root of 1215681653 is about 34866.6266363696. The cubic root of 1215681653 is about 1067.2675068790.

The spelling of 1215681653 in words is "one billion, two hundred fifteen million, six hundred eighty-one thousand, six hundred fifty-three".