142439251 has 2 divisors, whose sum is σ = 142439252. Its totient is φ = 142439250.

The previous prime is 142439239. The next prime is 142439261. The reversal of 142439251 is 152934241.

It is a strong prime.

It is an emirp because it is prime and its reverse (152934241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142439251 - 2⁷ = 142439123 is a prime.

It is not a weakly prime, because it can be changed into another prime (142439261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71219625 + 71219626.

It is an arithmetic number, because the mean of its divisors is an integer number (71219626).

Almost surely, 2^142439251 is an apocalyptic number.

142439251 is a deficient number, since it is larger than the sum of its proper divisors (1).

142439251 is an equidigital number, since it uses as much as digits as its factorization.

142439251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 142439251 is about 11934.7916194628. The cubic root of 142439251 is about 522.2477293830.

The spelling of 142439251 in words is "one hundred forty-two million, four hundred thirty-nine thousand, two hundred fifty-one".