1165890613 has 4 divisors (see below), whose sum is σ = 1166045760. Its totient is φ = 1165735468.

The previous prime is 1165890599. The next prime is 1165890619. The reversal of 1165890613 is 3160985611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1165890613 - 2²⁹ = 629019701 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 (1165890619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65695 + ... + 81532.

It is an arithmetic number, because the mean of its divisors is an integer number (291511440).

Almost surely, 2^1165890613 is an apocalyptic number.

It is an amenable number.

1165890613 is a deficient number, since it is larger than the sum of its proper divisors (155147).

1165890613 is an equidigital number, since it uses as much as digits as its factorization.

1165890613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155146.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 1165890613 is about 34145.1404009414. The cubic root of 1165890613 is about 1052.4931271661.

The spelling of 1165890613 in words is "one billion, one hundred sixty-five million, eight hundred ninety thousand, six hundred thirteen".