142787781 has 12 divisors (see below), whose sum is σ = 209075308. Its totient is φ = 93887424.

The previous prime is 142787741. The next prime is 142787797. The reversal of 142787781 is 187787241.

It can be written as a sum of positive squares in 2 ways, for example, as 104223681 + 38564100 = 10209^2 + 6210^2 .

It is not a de Polignac number, because 142787781 - 2²³ = 134399173 is a prime.

It is a super-3 number, since 3×142787781³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142787741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108010 + ... + 109323.

Almost surely, 2^142787781 is an apocalyptic number.

It is an amenable number.

142787781 is a deficient number, since it is larger than the sum of its proper divisors (66287527).

142787781 is a wasteful number, since it uses less digits than its factorization.

142787781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217412 (or 217409 counting only the distinct ones).

The product of its digits is 175616, while the sum is 45.

The square root of 142787781 is about 11949.3841263891. The cubic root of 142787781 is about 522.6733394648.

The spelling of 142787781 in words is "one hundred forty-two million, seven hundred eighty-seven thousand, seven hundred eighty-one".