181001232 has 30 divisors (see below), whose sum is σ = 506552462. Its totient is φ = 60333696.

The previous prime is 181001207. The next prime is 181001273. The reversal of 181001232 is 232100181.

It can be written as a sum of positive squares in only one way, i.e., 95179536 + 85821696 = 9756^2 + 9264^2 .

It is a super-2 number, since 2×181001232² = 65522891971035648, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 628333 + ... + 628620.

Almost surely, 2^181001232 is an apocalyptic number.

181001232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

181001232 is an abundant number, since it is smaller than the sum of its proper divisors (325551230).

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

181001232 is a wasteful number, since it uses less digits than its factorization.

181001232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256967 (or 1256958 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 181001232 is about 13453.6698339152. The cubic root of 181001232 is about 565.6665660041. Note that the first 3 decimals are identical.

The spelling of 181001232 in words is "one hundred eighty-one million, one thousand, two hundred thirty-two".