142668731 has 2 divisors, whose sum is σ = 142668732. Its totient is φ = 142668730.

The previous prime is 142668689. The next prime is 142668751. The reversal of 142668731 is 137866241.

142668731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (137866241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142668731 - 2¹⁸ = 142406587 is a prime.

It is a super-2 number, since 2×142668731² = 40708733610300722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (142668751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71334365 + 71334366.

It is an arithmetic number, because the mean of its divisors is an integer number (71334366).

Almost surely, 2^142668731 is an apocalyptic number.

142668731 is a deficient number, since it is larger than the sum of its proper divisors (1).

142668731 is an equidigital number, since it uses as much as digits as its factorization.

142668731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 142668731 is about 11944.4016593549. The cubic root of 142668731 is about 522.5280386043.

The spelling of 142668731 in words is "one hundred forty-two million, six hundred sixty-eight thousand, seven hundred thirty-one".