142441991 has 4 divisors (see below), whose sum is σ = 142949184. Its totient is φ = 141934800.

The previous prime is 142441973. The next prime is 142442023. The reversal of 142441991 is 199144241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199144241 = 8599 ⋅23159.

It is a cyclic number.

It is not a de Polignac number, because 142441991 - 2⁶ = 142441927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142441961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253175 + ... + 253736.

It is an arithmetic number, because the mean of its divisors is an integer number (35737296).

Almost surely, 2^142441991 is an apocalyptic number.

142441991 is a deficient number, since it is larger than the sum of its proper divisors (507193).

142441991 is an equidigital number, since it uses as much as digits as its factorization.

142441991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507192.

The product of its digits is 10368, while the sum is 35.

The square root of 142441991 is about 11934.9064093524. The cubic root of 142441991 is about 522.2510780611.

The spelling of 142441991 in words is "one hundred forty-two million, four hundred forty-one thousand, nine hundred ninety-one".