981815454 has 48 divisors (see below), whose sum is σ = 2170396800. Its totient is φ = 320688720.

The previous prime is 981815453. The next prime is 981815459. The reversal of 981815454 is 454518189.

It is a happy number.

981815454 is a `hidden beast` number, since 98 + 18 + 1 + 545 + 4 = 666.

It is a super-2 number, since 2×981815454² = 1927923171426452232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981815453) 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, 237949 + ... + 242039.

It is an arithmetic number, because the mean of its divisors is an integer number (45216600).

Almost surely, 2^981815454 is an apocalyptic number.

981815454 is an abundant number, since it is smaller than the sum of its proper divisors (1188581346).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

981815454 is a wasteful number, since it uses less digits than its factorization.

981815454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4365 (or 4362 counting only the distinct ones).

The product of its digits is 230400, while the sum is 45.

The square root of 981815454 is about 31333.9345438775. The cubic root of 981815454 is about 993.9013669511.

The spelling of 981815454 in words is "nine hundred eighty-one million, eight hundred fifteen thousand, four hundred fifty-four".