142322381 has 2 divisors, whose sum is σ = 142322382. Its totient is φ = 142322380.

The previous prime is 142322353. The next prime is 142322399. The reversal of 142322381 is 183223241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141253225 + 1069156 = 11885^2 + 1034^2 .

It is an emirp because it is prime and its reverse (183223241) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142322381 is a prime.

It is a super-2 number, since 2×142322381² = 40511320267018322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 142322381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142322311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71161190 + 71161191.

It is an arithmetic number, because the mean of its divisors is an integer number (71161191).

Almost surely, 2^142322381 is an apocalyptic number.

It is an amenable number.

142322381 is a deficient number, since it is larger than the sum of its proper divisors (1).

142322381 is an equidigital number, since it uses as much as digits as its factorization.

142322381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 26.

The square root of 142322381 is about 11929.8944253501. The cubic root of 142322381 is about 522.1048572645.

The spelling of 142322381 in words is "one hundred forty-two million, three hundred twenty-two thousand, three hundred eighty-one".