142457681 has 2 divisors, whose sum is σ = 142457682. Its totient is φ = 142457680.

The previous prime is 142457663. The next prime is 142457713. The reversal of 142457681 is 186754241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142444225 + 13456 = 11935^2 + 116^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142457681 is a prime.

It is a super-2 number, since 2×142457681² = 40588381751795522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (142457621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71228840 + 71228841.

It is an arithmetic number, because the mean of its divisors is an integer number (71228841).

Almost surely, 2^142457681 is an apocalyptic number.

It is an amenable number.

142457681 is a deficient number, since it is larger than the sum of its proper divisors (1).

142457681 is an equidigital number, since it uses as much as digits as its factorization.

142457681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 38.

The square root of 142457681 is about 11935.5637068385. The cubic root of 142457681 is about 522.2702526938.

The spelling of 142457681 in words is "one hundred forty-two million, four hundred fifty-seven thousand, six hundred eighty-one".