142221091 has 2 divisors, whose sum is σ = 142221092. Its totient is φ = 142221090.

The previous prime is 142221043. The next prime is 142221097. The reversal of 142221091 is 190122241.

142221091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 142221091 - 2⁹ = 142220579 is a prime.

It is not a weakly prime, because it can be changed into another prime (142221097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71110545 + 71110546.

It is an arithmetic number, because the mean of its divisors is an integer number (71110546).

Almost surely, 2^142221091 is an apocalyptic number.

142221091 is a deficient number, since it is larger than the sum of its proper divisors (1).

142221091 is an equidigital number, since it uses as much as digits as its factorization.

142221091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 142221091 is about 11925.6484519711. The cubic root of 142221091 is about 521.9809682193.

The spelling of 142221091 in words is "one hundred forty-two million, two hundred twenty-one thousand, ninety-one".