181465081 has 6 divisors (see below), whose sum is σ = 211092090. Its totient is φ = 155541456.

The previous prime is 181465051. The next prime is 181465099. The reversal of 181465081 is 180564181.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 101183481 + 80281600 = 10059^2 + 8960^2 .

It is not a de Polignac number, because 181465081 - 2¹³ = 181456889 is a prime.

It is a super-2 number, since 2×181465081² = 65859151244673122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181465001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1851636 + ... + 1851733.

It is an arithmetic number, because the mean of its divisors is an integer number (35182015).

Almost surely, 2^181465081 is an apocalyptic number.

It is an amenable number.

181465081 is a deficient number, since it is larger than the sum of its proper divisors (29627009).

181465081 is an equidigital number, since it uses as much as digits as its factorization.

181465081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3703383 (or 3703376 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 34.

The square root of 181465081 is about 13470.8975573271. The cubic root of 181465081 is about 566.1493620804.

The spelling of 181465081 in words is "one hundred eighty-one million, four hundred sixty-five thousand, eighty-one".