1564139 has 2 divisors, whose sum is σ = 1564140. Its totient is φ = 1564138.

The previous prime is 1564117. The next prime is 1564151. The reversal of 1564139 is 9314651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1564139 - 2²⁰ = 515563 is a prime.

It is a super-2 number, since 2×1564139² = 4893061622642, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1564159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 782069 + 782070.

It is an arithmetic number, because the mean of its divisors is an integer number (782070).

2^1564139 is an apocalyptic number.

1564139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1564139 is an equidigital number, since it uses as much as digits as its factorization.

1564139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 1564139 is about 1250.6554281656. The cubic root of 1564139 is about 116.0802803371.

The spelling of 1564139 in words is "one million, five hundred sixty-four thousand, one hundred thirty-nine".