142220531 has 2 divisors, whose sum is σ = 142220532. Its totient is φ = 142220530.

The previous prime is 142220509. The next prime is 142220579. The reversal of 142220531 is 135022241.

It is a weak prime.

It is an emirp because it is prime and its reverse (135022241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142220531 - 2¹⁸ = 141958387 is a prime.

It is a super-2 number, since 2×142220531² = 40453358875843922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (142220501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71110265 + 71110266.

It is an arithmetic number, because the mean of its divisors is an integer number (71110266).

Almost surely, 2^142220531 is an apocalyptic number.

142220531 is a deficient number, since it is larger than the sum of its proper divisors (1).

142220531 is an equidigital number, since it uses as much as digits as its factorization.

142220531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 142220531 is about 11925.6249731408. The cubic root of 142220531 is about 521.9802831129.

Adding to 142220531 its reverse (135022241), we get a palindrome (277242772).

The spelling of 142220531 in words is "one hundred forty-two million, two hundred twenty thousand, five hundred thirty-one".