142820681 has 2 divisors, whose sum is σ = 142820682. Its totient is φ = 142820680.

The previous prime is 142820653. The next prime is 142820683. The reversal of 142820681 is 186028241.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119006281 + 23814400 = 10909^2 + 4880^2 .

It is a cyclic number.

It is not a de Polignac number, because 142820681 - 2²² = 138626377 is a prime.

It is a super-2 number, since 2×142820681² = 40795493842607522, which contains 22 as substring.

Together with 142820683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (142820683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71410340 + 71410341.

It is an arithmetic number, because the mean of its divisors is an integer number (71410341).

Almost surely, 2^142820681 is an apocalyptic number.

It is an amenable number.

142820681 is a deficient number, since it is larger than the sum of its proper divisors (1).

142820681 is an equidigital number, since it uses as much as digits as its factorization.

142820681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 142820681 is about 11950.7606870860. The cubic root of 142820681 is about 522.7134797630.

The spelling of 142820681 in words is "one hundred forty-two million, eight hundred twenty thousand, six hundred eighty-one".