181491354 has 96 divisors (see below), whose sum is σ = 471272256. Its totient is φ = 51736320.

The previous prime is 181491353. The next prime is 181491421. The reversal of 181491354 is 453194181.

181491354 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×181491354² = 65878223153506632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (181491353) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 89884 + ... + 91880.

It is an arithmetic number, because the mean of its divisors is an integer number (4909086).

Almost surely, 2^181491354 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181491354, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235636128).

181491354 is an abundant number, since it is smaller than the sum of its proper divisors (289780902).

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

181491354 is a wasteful number, since it uses less digits than its factorization.

181491354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042 (or 2030 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 181491354 is about 13471.8726983297. The cubic root of 181491354 is about 566.1766836351.

It can be divided in two parts, 18149 and 1354, that added together give a triangular number (19503 = T₁₉₇).

The spelling of 181491354 in words is "one hundred eighty-one million, four hundred ninety-one thousand, three hundred fifty-four".