142217531 has 2 divisors, whose sum is σ = 142217532. Its totient is φ = 142217530.

The previous prime is 142217507. The next prime is 142217573. The reversal of 142217531 is 135712241.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 142217531 - 2²² = 138023227 is a prime.

It is a super-2 number, since 2×142217531² = 40451652247471922, 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 142217531.

It is not a weakly prime, because it can be changed into another prime (142217431) 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, 71108765 + 71108766.

It is an arithmetic number, because the mean of its divisors is an integer number (71108766).

Almost surely, 2^142217531 is an apocalyptic number.

142217531 is a deficient number, since it is larger than the sum of its proper divisors (1).

142217531 is an equidigital number, since it uses as much as digits as its factorization.

142217531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 26.

The square root of 142217531 is about 11925.4991929059. The cubic root of 142217531 is about 521.9766128696.

Adding to 142217531 its reverse (135712241), we get a palindrome (277929772).

The spelling of 142217531 in words is "one hundred forty-two million, two hundred seventeen thousand, five hundred thirty-one".