142749181 has 2 divisors, whose sum is σ = 142749182. Its totient is φ = 142749180.

The previous prime is 142749179. The next prime is 142749239. The reversal of 142749181 is 181947241.

142749181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84088900 + 58660281 = 9170^2 + 7659^2 .

It is a cyclic number.

It is not a de Polignac number, because 142749181 - 2¹ = 142749179 is a prime.

It is a super-2 number, since 2×142749181² = 40754657352341522, which contains 22 as substring.

Together with 142749179, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 142749181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142749151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71374590 + 71374591.

It is an arithmetic number, because the mean of its divisors is an integer number (71374591).

Almost surely, 2^142749181 is an apocalyptic number.

It is an amenable number.

142749181 is a deficient number, since it is larger than the sum of its proper divisors (1).

142749181 is an equidigital number, since it uses as much as digits as its factorization.

142749181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 37.

The square root of 142749181 is about 11947.7688712161. The cubic root of 142749181 is about 522.6262369069.

The spelling of 142749181 in words is "one hundred forty-two million, seven hundred forty-nine thousand, one hundred eighty-one".