2155007409 has 4 divisors (see below), whose sum is σ = 2873343216. Its totient is φ = 1436671604.

The previous prime is 2155007399. The next prime is 2155007423. The reversal of 2155007409 is 9047005512.

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 2155007409 - 2⁹ = 2155006897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2155007409.

It is not an unprimeable number, because it can be changed into a prime (2155007209) 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, 359167899 + ... + 359167904.

It is an arithmetic number, because the mean of its divisors is an integer number (718335804).

Almost surely, 2^2155007409 is an apocalyptic number.

It is an amenable number.

2155007409 is a deficient number, since it is larger than the sum of its proper divisors (718335807).

2155007409 is an equidigital number, since it uses as much as digits as its factorization.

2155007409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718335806.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 2155007409 is about 46422.0573542363. The cubic root of 2155007409 is about 1291.6641002090.

The spelling of 2155007409 in words is "two billion, one hundred fifty-five million, seven thousand, four hundred nine".