142777993 has 2 divisors, whose sum is σ = 142777994. Its totient is φ = 142777992.

The previous prime is 142777981. The next prime is 142778023. The reversal of 142777993 is 399777241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140114569 + 2663424 = 11837^2 + 1632^2 .

It is an emirp because it is prime and its reverse (399777241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142777993 - 2¹³ = 142769801 is a prime.

It is not a weakly prime, because it can be changed into another prime (142777903) 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, 71388996 + 71388997.

It is an arithmetic number, because the mean of its divisors is an integer number (71388997).

Almost surely, 2^142777993 is an apocalyptic number.

It is an amenable number.

142777993 is a deficient number, since it is larger than the sum of its proper divisors (1).

142777993 is an equidigital number, since it uses as much as digits as its factorization.

142777993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 666792, while the sum is 49.

The square root of 142777993 is about 11948.9745585134. The cubic root of 142777993 is about 522.6613962310.

The spelling of 142777993 in words is "one hundred forty-two million, seven hundred seventy-seven thousand, nine hundred ninety-three".