101244139 has 2 divisors, whose sum is σ = 101244140. Its totient is φ = 101244138.

The previous prime is 101244127. The next prime is 101244161. The reversal of 101244139 is 931442101.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (931442101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101244139 - 2⁵ = 101244107 is a prime.

It is not a weakly prime, because it can be changed into another prime (101244239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50622069 + 50622070.

It is an arithmetic number, because the mean of its divisors is an integer number (50622070).

Almost surely, 2^101244139 is an apocalyptic number.

101244139 is a deficient number, since it is larger than the sum of its proper divisors (1).

101244139 is an equidigital number, since it uses as much as digits as its factorization.

101244139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 101244139 is about 10062.0146591028. The cubic root of 101244139 is about 466.0758823913.

The spelling of 101244139 in words is "one hundred one million, two hundred forty-four thousand, one hundred thirty-nine".