142216891 has 2 divisors, whose sum is σ = 142216892. Its totient is φ = 142216890.

The previous prime is 142216859. The next prime is 142216897. The reversal of 142216891 is 198612241.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 142216891 - 2⁵ = 142216859 is a prime.

It is not a weakly prime, because it can be changed into another prime (142216897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71108445 + 71108446.

It is an arithmetic number, because the mean of its divisors is an integer number (71108446).

Almost surely, 2^142216891 is an apocalyptic number.

142216891 is a deficient number, since it is larger than the sum of its proper divisors (1).

142216891 is an equidigital number, since it uses as much as digits as its factorization.

142216891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 34.

The square root of 142216891 is about 11925.4723596175. The cubic root of 142216891 is about 521.9758298777.

It can be divided in two parts, 14221 and 6891, that added together give a palindrome (21112).

The spelling of 142216891 in words is "one hundred forty-two million, two hundred sixteen thousand, eight hundred ninety-one".