981803945 has 16 divisors (see below), whose sum is σ = 1229852160. Its totient is φ = 751555200.

The previous prime is 981803923. The next prime is 981803951. The reversal of 981803945 is 549308189.

It is not a de Polignac number, because 981803945 - 2¹⁴ = 981787561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 981803945.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21791 + ... + 49380.

It is an arithmetic number, because the mean of its divisors is an integer number (76865760).

Almost surely, 2^981803945 is an apocalyptic number.

It is an amenable number.

981803945 is a deficient number, since it is larger than the sum of its proper divisors (248048215).

981803945 is a wasteful number, since it uses less digits than its factorization.

981803945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71296.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 981803945 is about 31333.7508926078. The cubic root of 981803945 is about 993.8974833782.

The spelling of 981803945 in words is "nine hundred eighty-one million, eight hundred three thousand, nine hundred forty-five".