183123981 has 24 divisors (see below), whose sum is σ = 269904960. Its totient is φ = 119616000.

The previous prime is 183123961. The next prime is 183123991. The reversal of 183123981 is 189321381.

It is not a de Polignac number, because 183123981 - 2¹⁰ = 183122957 is a prime.

It is a super-2 number, since 2×183123981² = 67068784834576722, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (183123901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 113581 + ... + 115181.

It is an arithmetic number, because the mean of its divisors is an integer number (11246040).

Almost surely, 2^183123981 is an apocalyptic number.

It is an amenable number.

183123981 is a deficient number, since it is larger than the sum of its proper divisors (86780979).

183123981 is a wasteful number, since it uses less digits than its factorization.

183123981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1857 (or 1854 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 183123981 is about 13532.3309522048. The cubic root of 183123981 is about 567.8693214632.

The spelling of 183123981 in words is "one hundred eighty-three million, one hundred twenty-three thousand, nine hundred eighty-one".