2151899 has 2 divisors, whose sum is σ = 2151900. Its totient is φ = 2151898.

The previous prime is 2151869. The next prime is 2151917. The reversal of 2151899 is 9981512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2151899 - 2¹⁶ = 2086363 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2151869) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075949 + 1075950.

It is an arithmetic number, because the mean of its divisors is an integer number (1075950).

2^2151899 is an apocalyptic number.

2151899 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151899 is an equidigital number, since it uses as much as digits as its factorization.

2151899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 35.

The square root of 2151899 is about 1466.9352405611. The cubic root of 2151899 is about 129.1042764016.

The spelling of 2151899 in words is "two million, one hundred fifty-one thousand, eight hundred ninety-nine".