2138491 has 2 divisors, whose sum is σ = 2138492. Its totient is φ = 2138490.

The previous prime is 2138483. The next prime is 2138501. The reversal of 2138491 is 1948312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2138491 - 2³ = 2138483 is a prime.

It is not a weakly prime, because it can be changed into another prime (2138401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069245 + 1069246.

It is an arithmetic number, because the mean of its divisors is an integer number (1069246).

2^2138491 is an apocalyptic number.

2138491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138491 is an equidigital number, since it uses as much as digits as its factorization.

2138491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 2138491 is about 1462.3580272970. The cubic root of 2138491 is about 128.8355776298.

The spelling of 2138491 in words is "two million, one hundred thirty-eight thousand, four hundred ninety-one".