142532581 has 2 divisors, whose sum is σ = 142532582. Its totient is φ = 142532580.

The previous prime is 142532569. The next prime is 142532591. The reversal of 142532581 is 185235241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142420356 + 112225 = 11934^2 + 335^2 .

It is an emirp because it is prime and its reverse (185235241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142532581 - 2⁹ = 142532069 is a prime.

It is a super-2 number, since 2×142532581² = 40631073293043122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142532531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71266290 + 71266291.

It is an arithmetic number, because the mean of its divisors is an integer number (71266291).

Almost surely, 2^142532581 is an apocalyptic number.

It is an amenable number.

142532581 is a deficient number, since it is larger than the sum of its proper divisors (1).

142532581 is an equidigital number, since it uses as much as digits as its factorization.

142532581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9600, while the sum is 31.

The square root of 142532581 is about 11938.7009762369. The cubic root of 142532581 is about 522.3617680312.

The spelling of 142532581 in words is "one hundred forty-two million, five hundred thirty-two thousand, five hundred eighty-one".