142769681 has 2 divisors, whose sum is σ = 142769682. Its totient is φ = 142769680.

The previous prime is 142769659. The next prime is 142769699. The reversal of 142769681 is 186967241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120121600 + 22648081 = 10960^2 + 4759^2 .

It is a cyclic number.

It is not a de Polignac number, because 142769681 - 2²² = 138575377 is a prime.

It is a super-2 number, since 2×142769681² = 40766363625683522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (142769611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71384840 + 71384841.

It is an arithmetic number, because the mean of its divisors is an integer number (71384841).

Almost surely, 2^142769681 is an apocalyptic number.

It is an amenable number.

142769681 is a deficient number, since it is larger than the sum of its proper divisors (1).

142769681 is an equidigital number, since it uses as much as digits as its factorization.

142769681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 142769681 is about 11948.6267411783. The cubic root of 142769681 is about 522.6512535712.

The spelling of 142769681 in words is "one hundred forty-two million, seven hundred sixty-nine thousand, six hundred eighty-one".