1615091009 has 12 divisors (see below), whose sum is σ = 1893128688. Its totient is φ = 1373790600.

The previous prime is 1615091003. The next prime is 1615091021. The reversal of 1615091009 is 9001905161.

It is a happy number.

It is not a de Polignac number, because 1615091009 - 2²⁰ = 1614042433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1615091003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 119387 + ... + 132224.

It is an arithmetic number, because the mean of its divisors is an integer number (157760724).

Almost surely, 2^1615091009 is an apocalyptic number.

It is an amenable number.

1615091009 is a deficient number, since it is larger than the sum of its proper divisors (278037679).

1615091009 is a wasteful number, since it uses less digits than its factorization.

1615091009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251756 (or 251749 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 32.

The square root of 1615091009 is about 40188.1948960139. The cubic root of 1615091009 is about 1173.2727926878.

The spelling of 1615091009 in words is "one billion, six hundred fifteen million, ninety-one thousand, nine".