142120991 has 2 divisors, whose sum is σ = 142120992. Its totient is φ = 142120990.

The previous prime is 142120987. The next prime is 142121009. The reversal of 142120991 is 199021241.

It is a weak prime.

It is an emirp because it is prime and its reverse (199021241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142120991 - 2² = 142120987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142120961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71060495 + 71060496.

It is an arithmetic number, because the mean of its divisors is an integer number (71060496).

Almost surely, 2^142120991 is an apocalyptic number.

142120991 is a deficient number, since it is larger than the sum of its proper divisors (1).

142120991 is an equidigital number, since it uses as much as digits as its factorization.

142120991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 142120991 is about 11921.4508764663. The cubic root of 142120991 is about 521.8584768742.

The spelling of 142120991 in words is "one hundred forty-two million, one hundred twenty thousand, nine hundred ninety-one".