142240981 has 2 divisors, whose sum is σ = 142240982. Its totient is φ = 142240980.

The previous prime is 142240949. The next prime is 142240999. The reversal of 142240981 is 189042241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141491025 + 749956 = 11895^2 + 866^2 .

It is a cyclic number.

It is not a de Polignac number, because 142240981 - 2⁵ = 142240949 is a prime.

It is a super-2 number, since 2×142240981² = 40464993351684722, which contains 22 as substring.

It is a Chen prime.

It is equal to p_8031577 and since 142240981 and 8031577 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142240481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71120490 + 71120491.

It is an arithmetic number, because the mean of its divisors is an integer number (71120491).

Almost surely, 2^142240981 is an apocalyptic number.

It is an amenable number.

142240981 is a deficient number, since it is larger than the sum of its proper divisors (1).

142240981 is an equidigital number, since it uses as much as digits as its factorization.

142240981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 142240981 is about 11926.4823397345. The cubic root of 142240981 is about 522.0053005632.

The spelling of 142240981 in words is "one hundred forty-two million, two hundred forty thousand, nine hundred eighty-one".