142246981991 has 2 divisors, whose sum is σ = 142246981992. Its totient is φ = 142246981990.

The previous prime is 142246981969. The next prime is 142246982069. The reversal of 142246981991 is 199189642241.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142246981991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142246981691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71123490995 + 71123490996.

It is an arithmetic number, because the mean of its divisors is an integer number (71123490996).

Almost surely, 2^142246981991 is an apocalyptic number.

142246981991 is a deficient number, since it is larger than the sum of its proper divisors (1).

142246981991 is an equidigital number, since it uses as much as digits as its factorization.

142246981991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 56.

The spelling of 142246981991 in words is "one hundred forty-two billion, two hundred forty-six million, nine hundred eighty-one thousand, nine hundred ninety-one".