2155914905 has 16 divisors (see below), whose sum is σ = 2604138768. Its totient is φ = 1713408000.

The previous prime is 2155914899. The next prime is 2155914911. The reversal of 2155914905 is 5094195512.

It is an interprime number because it is at equal distance from previous prime (2155914899) and next prime (2155914911).

It can be written as a sum of positive squares in 8 ways, for example, as 2676496 + 2153238409 = 1636^2 + 46403^2 .

It is not a de Polignac number, because 2155914905 - 2⁶ = 2155914841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 553565 + ... + 557445.

It is an arithmetic number, because the mean of its divisors is an integer number (162758673).

Almost surely, 2^2155914905 is an apocalyptic number.

It is an amenable number.

2155914905 is a deficient number, since it is larger than the sum of its proper divisors (448223863).

2155914905 is a wasteful number, since it uses less digits than its factorization.

2155914905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4588.

The product of its (nonzero) digits is 81000, while the sum is 41.

The square root of 2155914905 is about 46431.8307306529. The cubic root of 2155914905 is about 1291.8453858199.

The spelling of 2155914905 in words is "two billion, one hundred fifty-five million, nine hundred fourteen thousand, nine hundred five".