2301981 has 16 divisors (see below), whose sum is σ = 3394560. Its totient is φ = 1375920.

The previous prime is 2301977. The next prime is 2301989. The reversal of 2301981 is 1891032.

It is not a de Polignac number, because 2301981 - 2² = 2301977 is a prime.

It is a super-2 number, since 2×2301981² = 10598233048722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2301989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2166 + ... + 3048.

It is an arithmetic number, because the mean of its divisors is an integer number (212160).

2^2301981 is an apocalyptic number.

It is an amenable number.

2301981 is a deficient number, since it is larger than the sum of its proper divisors (1092579).

2301981 is a wasteful number, since it uses less digits than its factorization.

2301981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 2301981 is about 1517.2280645968. The cubic root of 2301981 is about 132.0384988714.

It can be divided in two parts, 230 and 1981, that added together give a triangular number (2211 = T₆₆).

The spelling of 2301981 in words is "two million, three hundred one thousand, nine hundred eighty-one".