142907581 has 2 divisors, whose sum is σ = 142907582. Its totient is φ = 142907580.

The previous prime is 142907561. The next prime is 142907587. The reversal of 142907581 is 185709241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125552025 + 17355556 = 11205^2 + 4166^2 .

It is a cyclic number.

It is not a de Polignac number, because 142907581 - 2⁹ = 142907069 is a prime.

It is a super-2 number, since 2×142907581² = 40845153414543122, 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 142907581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142907587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71453790 + 71453791.

It is an arithmetic number, because the mean of its divisors is an integer number (71453791).

Almost surely, 2^142907581 is an apocalyptic number.

It is an amenable number.

142907581 is a deficient number, since it is larger than the sum of its proper divisors (1).

142907581 is an equidigital number, since it uses as much as digits as its factorization.

142907581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 142907581 is about 11954.3958860329. The cubic root of 142907581 is about 522.8194741970.

The spelling of 142907581 in words is "one hundred forty-two million, nine hundred seven thousand, five hundred eighty-one".