2155240499 has 4 divisors (see below), whose sum is σ = 2181207336. Its totient is φ = 2129273664.

The previous prime is 2155240489. The next prime is 2155240511. The reversal of 2155240499 is 9940425512.

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 2155240499 - 2¹² = 2155236403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155240489) 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, 12983294 + ... + 12983459.

It is an arithmetic number, because the mean of its divisors is an integer number (545301834).

Almost surely, 2^2155240499 is an apocalyptic number.

2155240499 is a deficient number, since it is larger than the sum of its proper divisors (25966837).

2155240499 is an equidigital number, since it uses as much as digits as its factorization.

2155240499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25966836.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 2155240499 is about 46424.5678385917. The cubic root of 2155240499 is about 1291.7106682053.

The spelling of 2155240499 in words is "two billion, one hundred fifty-five million, two hundred forty thousand, four hundred ninety-nine".