2189131555 has 16 divisors (see below), whose sum is σ = 2926586880. Its totient is φ = 1560843648.

The previous prime is 2189131547. The next prime is 2189131561. The reversal of 2189131555 is 5551319812.

It is a happy number.

It is not a de Polignac number, because 2189131555 - 2³ = 2189131547 is a prime.

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, 578787 + ... + 582556.

It is an arithmetic number, because the mean of its divisors is an integer number (182911680).

Almost surely, 2^2189131555 is an apocalyptic number.

2189131555 is a deficient number, since it is larger than the sum of its proper divisors (737455325).

2189131555 is a wasteful number, since it uses less digits than its factorization.

2189131555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161390.

The product of its digits is 54000, while the sum is 40.

The square root of 2189131555 is about 46788.1561402028. The cubic root of 2189131555 is about 1298.4461820089.

The spelling of 2189131555 in words is "two billion, one hundred eighty-nine million, one hundred thirty-one thousand, five hundred fifty-five".