981808451 has 24 divisors (see below), whose sum is σ = 1125132624. Its totient is φ = 851497920.

The previous prime is 981808397. The next prime is 981808469. The reversal of 981808451 is 154808189.

It is not a de Polignac number, because 981808451 - 2²⁶ = 914699587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981808351) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 613985 + ... + 615581.

It is an arithmetic number, because the mean of its divisors is an integer number (46880526).

Almost surely, 2^981808451 is an apocalyptic number.

981808451 is a deficient number, since it is larger than the sum of its proper divisors (143324173).

981808451 is a wasteful number, since it uses less digits than its factorization.

981808451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779 (or 1760 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 44.

The square root of 981808451 is about 31333.8227958224. The cubic root of 981808451 is about 993.8990038770.

The spelling of 981808451 in words is "nine hundred eighty-one million, eight hundred eight thousand, four hundred fifty-one".