2158909499 has 4 divisors (see below), whose sum is σ = 2194301520. Its totient is φ = 2123517480.

The previous prime is 2158909477. The next prime is 2158909517. The reversal of 2158909499 is 9949098512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2158909499 - 2²⁰ = 2157860923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2158909439) 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, 17695919 + ... + 17696040.

It is an arithmetic number, because the mean of its divisors is an integer number (548575380).

Almost surely, 2^2158909499 is an apocalyptic number.

2158909499 is a deficient number, since it is larger than the sum of its proper divisors (35392021).

2158909499 is an equidigital number, since it uses as much as digits as its factorization.

2158909499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35392020.

The product of its (nonzero) digits is 2099520, while the sum is 56.

The square root of 2158909499 is about 46464.0667505547. The cubic root of 2158909499 is about 1292.4432391422.

The spelling of 2158909499 in words is "two billion, one hundred fifty-eight million, nine hundred nine thousand, four hundred ninety-nine".