2154861187 has 2 divisors, whose sum is σ = 2154861188. Its totient is φ = 2154861186.

The previous prime is 2154861179. The next prime is 2154861223. The reversal of 2154861187 is 7811684512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2154861187 - 2³ = 2154861179 is a prime.

It is not a weakly prime, because it can be changed into another prime (2154861127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077430593 + 1077430594.

It is an arithmetic number, because the mean of its divisors is an integer number (1077430594).

Almost surely, 2^2154861187 is an apocalyptic number.

2154861187 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154861187 is an equidigital number, since it uses as much as digits as its factorization.

2154861187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 43.

The square root of 2154861187 is about 46420.4824080922. The cubic root of 2154861187 is about 1291.6348854634.

The spelling of 2154861187 in words is "two billion, one hundred fifty-four million, eight hundred sixty-one thousand, one hundred eighty-seven".