142436981 has 2 divisors, whose sum is σ = 142436982. Its totient is φ = 142436980.

The previous prime is 142436963. The next prime is 142436989. The reversal of 142436981 is 189634241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140896900 + 1540081 = 11870^2 + 1241^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142436981 is a prime.

It is a super-2 number, since 2×142436981² = 40576587112788722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142436989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71218490 + 71218491.

It is an arithmetic number, because the mean of its divisors is an integer number (71218491).

Almost surely, 2^142436981 is an apocalyptic number.

It is an amenable number.

142436981 is a deficient number, since it is larger than the sum of its proper divisors (1).

142436981 is an equidigital number, since it uses as much as digits as its factorization.

142436981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 38.

The square root of 142436981 is about 11934.6965189736. The cubic root of 142436981 is about 522.2449550807.

The spelling of 142436981 in words is "one hundred forty-two million, four hundred thirty-six thousand, nine hundred eighty-one".