1215137506 has 16 divisors (see below), whose sum is σ = 1995595200. Its totient is φ = 550338480.

The previous prime is 1215137503. The next prime is 1215137531. The reversal of 1215137506 is 6057315121.

It is not an unprimeable number, because it can be changed into a prime (1215137501) 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, 93606 + ... + 105793.

It is an arithmetic number, because the mean of its divisors is an integer number (124724700).

Almost surely, 2^1215137506 is an apocalyptic number.

1215137506 is a deficient number, since it is larger than the sum of its proper divisors (780457694).

1215137506 is a wasteful number, since it uses less digits than its factorization.

1215137506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199689.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 1215137506 is about 34858.8224987592. The cubic root of 1215137506 is about 1067.1082444928.

The spelling of 1215137506 in words is "one billion, two hundred fifteen million, one hundred thirty-seven thousand, five hundred six".