2155115445 has 32 divisors (see below), whose sum is σ = 3981427968. Its totient is φ = 975034368.

The previous prime is 2155115441. The next prime is 2155115447. The reversal of 2155115445 is 5445115512.

It is a happy number.

It is not a de Polignac number, because 2155115445 - 2² = 2155115441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155115441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95614 + ... + 115983.

It is an arithmetic number, because the mean of its divisors is an integer number (124419624).

Almost surely, 2^2155115445 is an apocalyptic number.

It is an amenable number.

2155115445 is a deficient number, since it is larger than the sum of its proper divisors (1826312523).

2155115445 is a wasteful number, since it uses less digits than its factorization.

2155115445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211709.

The product of its digits is 20000, while the sum is 33.

The square root of 2155115445 is about 46423.2209675287. The cubic root of 2155115445 is about 1291.6856846500.

The spelling of 2155115445 in words is "two billion, one hundred fifty-five million, one hundred fifteen thousand, four hundred forty-five".