2154861188 has 6 divisors (see below), whose sum is σ = 3771007086. Its totient is φ = 1077430592.

The previous prime is 2154861187. The next prime is 2154861223. The reversal of 2154861188 is 8811684512.

It can be written as a sum of positive squares in only one way, i.e., 2137952644 + 16908544 = 46238^2 + 4112^2 .

It is not an unprimeable number, because it can be changed into a prime (2154861187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269357645 + ... + 269357652.

It is an arithmetic number, because the mean of its divisors is an integer number (628501181).

Almost surely, 2^2154861188 is an apocalyptic number.

It is an amenable number.

2154861188 is a deficient number, since it is larger than the sum of its proper divisors (1616145898).

2154861188 is a wasteful number, since it uses less digits than its factorization.

2154861188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538715301 (or 538715299 counting only the distinct ones).

The product of its digits is 122880, while the sum is 44.

The square root of 2154861188 is about 46420.4824188633. The cubic root of 2154861188 is about 1291.6348856632.

The spelling of 2154861188 in words is "two billion, one hundred fifty-four million, eight hundred sixty-one thousand, one hundred eighty-eight".