1215153983 has 8 divisors (see below), whose sum is σ = 1222814208. Its totient is φ = 1207513944.

The previous prime is 1215153959. The next prime is 1215153991. The reversal of 1215153983 is 3893515121.

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 1215153983 - 2²⁸ = 946718527 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 (1215153913) 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, 126260 + ... + 135542.

It is an arithmetic number, because the mean of its divisors is an integer number (152851776).

Almost surely, 2^1215153983 is an apocalyptic number.

1215153983 is a deficient number, since it is larger than the sum of its proper divisors (7660225).

1215153983 is an equidigital number, since it uses as much as digits as its factorization.

1215153983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10093.

The product of its digits is 32400, while the sum is 38.

The square root of 1215153983 is about 34859.0588369795. The cubic root of 1215153983 is about 1067.1130677228.

The spelling of 1215153983 in words is "one billion, two hundred fifteen million, one hundred fifty-three thousand, nine hundred eighty-three".