142631779 has 2 divisors, whose sum is σ = 142631780. Its totient is φ = 142631778.

The previous prime is 142631771. The next prime is 142631791. The reversal of 142631779 is 977136241.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 142631779 - 2³ = 142631771 is a prime.

It is not a weakly prime, because it can be changed into another prime (142631771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71315889 + 71315890.

It is an arithmetic number, because the mean of its divisors is an integer number (71315890).

Almost surely, 2^142631779 is an apocalyptic number.

142631779 is a deficient number, since it is larger than the sum of its proper divisors (1).

142631779 is an equidigital number, since it uses as much as digits as its factorization.

142631779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 40.

The square root of 142631779 is about 11942.8547257345. The cubic root of 142631779 is about 522.4829221466.

The spelling of 142631779 in words is "one hundred forty-two million, six hundred thirty-one thousand, seven hundred seventy-nine".