24201981 has 6 divisors (see below), whose sum is σ = 34958430. Its totient is φ = 16134648.

The previous prime is 24201971. The next prime is 24201997. The reversal of 24201981 is 18910242.

It can be written as a sum of positive squares in only one way, i.e., 17264025 + 6937956 = 4155^2 + 2634^2 .

It is not a de Polignac number, because 24201981 - 2⁵ = 24201949 is a prime.

It is a super-2 number, since 2×24201981² = 1171471768648722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24201901) 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, 1344546 + ... + 1344563.

It is an arithmetic number, because the mean of its divisors is an integer number (5826405).

Almost surely, 2^24201981 is an apocalyptic number.

It is an amenable number.

24201981 is a deficient number, since it is larger than the sum of its proper divisors (10756449).

24201981 is a wasteful number, since it uses less digits than its factorization.

24201981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2689115 (or 2689112 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 24201981 is about 4919.5508941366. The cubic root of 24201981 is about 289.2568407527.

The spelling of 24201981 in words is "twenty-four million, two hundred one thousand, nine hundred eighty-one".