142139917 has 2 divisors, whose sum is σ = 142139918. Its totient is φ = 142139916.

The previous prime is 142139861. The next prime is 142139923. The reversal of 142139917 is 719931241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119377476 + 22762441 = 10926^2 + 4771^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142139917 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142139927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71069958 + 71069959.

It is an arithmetic number, because the mean of its divisors is an integer number (71069959).

Almost surely, 2^142139917 is an apocalyptic number.

It is an amenable number.

142139917 is a deficient number, since it is larger than the sum of its proper divisors (1).

142139917 is an equidigital number, since it uses as much as digits as its factorization.

142139917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 37.

The square root of 142139917 is about 11922.2446292634. The cubic root of 142139917 is about 521.8816408349.

The spelling of 142139917 in words is "one hundred forty-two million, one hundred thirty-nine thousand, nine hundred seventeen".