142087481 has 4 divisors (see below), whose sum is σ = 142171764. Its totient is φ = 142003200.

The previous prime is 142087471. The next prime is 142087487. The reversal of 142087481 is 184780241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 111936400 + 30151081 = 10580^2 + 5491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142087481 is a prime.

It is a super-2 number, since 2×142087481² = 40377704513850722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142087487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39560 + ... + 43001.

It is an arithmetic number, because the mean of its divisors is an integer number (35542941).

Almost surely, 2^142087481 is an apocalyptic number.

It is an amenable number.

142087481 is a deficient number, since it is larger than the sum of its proper divisors (84283).

142087481 is an equidigital number, since it uses as much as digits as its factorization.

142087481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84282.

The product of its (nonzero) digits is 14336, while the sum is 35.

The square root of 142087481 is about 11920.0453438735. The cubic root of 142087481 is about 521.8174581805.

The spelling of 142087481 in words is "one hundred forty-two million, eighty-seven thousand, four hundred eighty-one".