142457891 has 2 divisors, whose sum is σ = 142457892. Its totient is φ = 142457890.

The previous prime is 142457873. The next prime is 142457911. The reversal of 142457891 is 198754241.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142457891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (142457851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71228945 + 71228946.

It is an arithmetic number, because the mean of its divisors is an integer number (71228946).

Almost surely, 2^142457891 is an apocalyptic number.

142457891 is a deficient number, since it is larger than the sum of its proper divisors (1).

142457891 is an equidigital number, since it uses as much as digits as its factorization.

142457891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 41.

The square root of 142457891 is about 11935.5725040737. The cubic root of 142457891 is about 522.2705093237.

The spelling of 142457891 in words is "one hundred forty-two million, four hundred fifty-seven thousand, eight hundred ninety-one".