1491165515 has 32 divisors (see below), whose sum is σ = 2084109696. Its totient is φ = 1003161600.

The previous prime is 1491165439. The next prime is 1491165517. The reversal of 1491165515 is 5155611941.

It is a de Polignac number, because none of the positive numbers 2^k-1491165515 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1491165517) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 397589 + ... + 401321.

It is an arithmetic number, because the mean of its divisors is an integer number (65128428).

Almost surely, 2^1491165515 is an apocalyptic number.

1491165515 is a deficient number, since it is larger than the sum of its proper divisors (592944181).

1491165515 is a wasteful number, since it uses less digits than its factorization.

1491165515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3959.

The product of its digits is 27000, while the sum is 38.

The square root of 1491165515 is about 38615.6123219612. The cubic root of 1491165515 is about 1142.4624914467.

The spelling of 1491165515 in words is "one billion, four hundred ninety-one million, one hundred sixty-five thousand, five hundred fifteen".