221592139 has 2 divisors, whose sum is σ = 221592140. Its totient is φ = 221592138.

The previous prime is 221592131. The next prime is 221592187. The reversal of 221592139 is 931295122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221592139 - 2³ = 221592131 is a prime.

It is a super-4 number, since 4×221592139⁴ (a number of 34 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (221592131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110796069 + 110796070.

It is an arithmetic number, because the mean of its divisors is an integer number (110796070).

Almost surely, 2^221592139 is an apocalyptic number.

221592139 is a deficient number, since it is larger than the sum of its proper divisors (1).

221592139 is an equidigital number, since it uses as much as digits as its factorization.

221592139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 34.

The square root of 221592139 is about 14885.9712145362. The cubic root of 221592139 is about 605.1338537701.

The spelling of 221592139 in words is "two hundred twenty-one million, five hundred ninety-two thousand, one hundred thirty-nine".