987441781 has 16 divisors (see below), whose sum is σ = 1017878400. Its totient is φ = 957528000.

The previous prime is 987441757. The next prime is 987441803. The reversal of 987441781 is 187144789.

It is a cyclic number.

It is not a de Polignac number, because 987441781 - 2¹³ = 987433589 is a prime.

It is a super-2 number, since 2×987441781² = 1950082541728903922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987441701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2647111 + ... + 2647483.

It is an arithmetic number, because the mean of its divisors is an integer number (63617400).

Almost surely, 2^987441781 is an apocalyptic number.

It is an amenable number.

987441781 is a deficient number, since it is larger than the sum of its proper divisors (30436619).

987441781 is a wasteful number, since it uses less digits than its factorization.

987441781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876.

The product of its digits is 451584, while the sum is 49.

The square root of 987441781 is about 31423.5863802972. The cubic root of 987441781 is about 995.7962805041.

The spelling of 987441781 in words is "nine hundred eighty-seven million, four hundred forty-one thousand, seven hundred eighty-one".