4139491 has 2 divisors, whose sum is σ = 4139492. Its totient is φ = 4139490.

The previous prime is 4139477. The next prime is 4139497. The reversal of 4139491 is 1949314.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4139491 - 2¹⁵ = 4106723 is a prime.

It is not a weakly prime, because it can be changed into another prime (4139497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2069745 + 2069746.

It is an arithmetic number, because the mean of its divisors is an integer number (2069746).

Almost surely, 2^4139491 is an apocalyptic number.

4139491 is a deficient number, since it is larger than the sum of its proper divisors (1).

4139491 is an equidigital number, since it uses as much as digits as its factorization.

4139491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 31.

The square root of 4139491 is about 2034.5739111667. The cubic root of 4139491 is about 160.5642965317.

The spelling of 4139491 in words is "four million, one hundred thirty-nine thousand, four hundred ninety-one".