139879541 has 2 divisors, whose sum is σ = 139879542. Its totient is φ = 139879540.

The previous prime is 139879511. The next prime is 139879543. The reversal of 139879541 is 145978931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103022500 + 36857041 = 10150^2 + 6071^2 .

It is a cyclic number.

It is not a de Polignac number, because 139879541 - 2²² = 135685237 is a prime.

Together with 139879543, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139879543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69939770 + 69939771.

It is an arithmetic number, because the mean of its divisors is an integer number (69939771).

Almost surely, 2^139879541 is an apocalyptic number.

It is an amenable number.

139879541 is a deficient number, since it is larger than the sum of its proper divisors (1).

139879541 is an equidigital number, since it uses as much as digits as its factorization.

139879541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 47.

The square root of 139879541 is about 11827.0681489539. The cubic root of 139879541 is about 519.1004430123.

The spelling of 139879541 in words is "one hundred thirty-nine million, eight hundred seventy-nine thousand, five hundred forty-one".