181370981 has 8 divisors (see below), whose sum is σ = 198268128. Its totient is φ = 164542000.

The previous prime is 181370963. The next prime is 181370999. The reversal of 181370981 is 189073181.

It is an interprime number because it is at equal distance from previous prime (181370963) and next prime (181370999).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 181370981 - 2²² = 177176677 is a prime.

It is a super-2 number, since 2×181370981² = 65790865497804722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181370911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11390 + ... + 22191.

It is an arithmetic number, because the mean of its divisors is an integer number (24783516).

Almost surely, 2^181370981 is an apocalyptic number.

181370981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

181370981 is a deficient number, since it is larger than the sum of its proper divisors (16897147).

181370981 is a wasteful number, since it uses less digits than its factorization.

181370981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34083.

The product of its (nonzero) digits is 12096, while the sum is 38.

The square root of 181370981 is about 13467.4043898592. The cubic root of 181370981 is about 566.0514849095.

The spelling of 181370981 in words is "one hundred eighty-one million, three hundred seventy thousand, nine hundred eighty-one".