142621181 has 2 divisors, whose sum is σ = 142621182. Its totient is φ = 142621180.

The previous prime is 142621139. The next prime is 142621187. The reversal of 142621181 is 181126241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113081956 + 29539225 = 10634^2 + 5435^2 .

It is an emirp because it is prime and its reverse (181126241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142621181 - 2²² = 138426877 is a prime.

It is a super-2 number, since 2×142621181² = 40681602539669522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 142621181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142621187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71310590 + 71310591.

It is an arithmetic number, because the mean of its divisors is an integer number (71310591).

Almost surely, 2^142621181 is an apocalyptic number.

It is an amenable number.

142621181 is a deficient number, since it is larger than the sum of its proper divisors (1).

142621181 is an equidigital number, since it uses as much as digits as its factorization.

142621181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 26.

The square root of 142621181 is about 11942.4110212302. The cubic root of 142621181 is about 522.4699811054.

The spelling of 142621181 in words is "one hundred forty-two million, six hundred twenty-one thousand, one hundred eighty-one".