43139563 has 2 divisors, whose sum is σ = 43139564. Its totient is φ = 43139562.

The previous prime is 43139549. The next prime is 43139567. The reversal of 43139563 is 36593134.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43139563 - 2⁹ = 43139051 is a prime.

It is a super-2 number, since 2×43139563² = 3722043791661938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43139567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21569781 + 21569782.

It is an arithmetic number, because the mean of its divisors is an integer number (21569782).

Almost surely, 2^43139563 is an apocalyptic number.

43139563 is a deficient number, since it is larger than the sum of its proper divisors (1).

43139563 is an equidigital number, since it uses as much as digits as its factorization.

43139563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 34.

The square root of 43139563 is about 6568.0714825586. The cubic root of 43139563 is about 350.7184236464.

The spelling of 43139563 in words is "forty-three million, one hundred thirty-nine thousand, five hundred sixty-three".