87781245841 has 3 divisors (see below), whose sum is σ = 87781542121. Its totient is φ = 87780949562.

The previous prime is 87781245833. The next prime is 87781245847. The reversal of 87781245841 is 14854218778.

The square root of 87781245841 is 296279.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 87781245841 - 2³ = 87781245833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87781245847) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 148140 + ... + 444418.

Almost surely, 2^87781245841 is an apocalyptic number.

87781245841 is the 296279-th square number.

87781245841 is the 148140-th centered octagonal number.

It is an amenable number.

87781245841 is a deficient number, since it is larger than the sum of its proper divisors (296280).

87781245841 is an frugal number, since it uses more digits than its factorization.

87781245841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592558 (or 296279 counting only the distinct ones).

The product of its digits is 4014080, while the sum is 55.

The spelling of 87781245841 in words is "eighty-seven billion, seven hundred eighty-one million, two hundred forty-five thousand, eight hundred forty-one".