142057991 has 2 divisors, whose sum is σ = 142057992. Its totient is φ = 142057990.

The previous prime is 142057987. The next prime is 142057997. The reversal of 142057991 is 199750241.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 142057991 - 2² = 142057987 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142057997) 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, 71028995 + 71028996.

It is an arithmetic number, because the mean of its divisors is an integer number (71028996).

Almost surely, 2^142057991 is an apocalyptic number.

142057991 is a deficient number, since it is larger than the sum of its proper divisors (1).

142057991 is an equidigital number, since it uses as much as digits as its factorization.

142057991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 142057991 is about 11918.8082877442. The cubic root of 142057991 is about 521.7813549258.

The spelling of 142057991 in words is "one hundred forty-two million, fifty-seven thousand, nine hundred ninety-one".