142171481391 has 4 divisors (see below), whose sum is σ = 189561975192. Its totient is φ = 94780987592.

The previous prime is 142171481383. The next prime is 142171481467. The reversal of 142171481391 is 193184171241.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 142171481391 - 2³ = 142171481383 is a prime.

It is a super-2 number, since 2×142171481391² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142171481791) 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, 23695246896 + ... + 23695246901.

It is an arithmetic number, because the mean of its divisors is an integer number (47390493798).

Almost surely, 2^142171481391 is an apocalyptic number.

142171481391 is a deficient number, since it is larger than the sum of its proper divisors (47390493801).

142171481391 is an equidigital number, since it uses as much as digits as its factorization.

142171481391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47390493800.

The product of its digits is 48384, while the sum is 42.

The spelling of 142171481391 in words is "one hundred forty-two billion, one hundred seventy-one million, four hundred eighty-one thousand, three hundred ninety-one".