142513981 has 2 divisors, whose sum is σ = 142513982. Its totient is φ = 142513980.

The previous prime is 142513967. The next prime is 142514017. The reversal of 142513981 is 189315241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118592100 + 23921881 = 10890^2 + 4891^2 .

It is an emirp because it is prime and its reverse (189315241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142513981 - 2⁷ = 142513853 is a prime.

It is a super-2 number, since 2×142513981² = 40620469560936722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142513081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71256990 + 71256991.

It is an arithmetic number, because the mean of its divisors is an integer number (71256991).

Almost surely, 2^142513981 is an apocalyptic number.

It is an amenable number.

142513981 is a deficient number, since it is larger than the sum of its proper divisors (1).

142513981 is an equidigital number, since it uses as much as digits as its factorization.

142513981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 34.

The square root of 142513981 is about 11937.9219715996. The cubic root of 142513981 is about 522.3390449189.

The spelling of 142513981 in words is "one hundred forty-two million, five hundred thirteen thousand, nine hundred eighty-one".