2013981 has 16 divisors (see below), whose sum is σ = 2865600. Its totient is φ = 1254528.

The previous prime is 2013967. The next prime is 2013983. The reversal of 2013981 is 1893102.

It is not a de Polignac number, because 2013981 - 2¹⁰ = 2012957 is a prime.

It is a super-2 number, since 2×2013981² = 8112238936722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2013983) 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, 4875 + ... + 5271.

It is an arithmetic number, because the mean of its divisors is an integer number (179100).

2^2013981 is an apocalyptic number.

It is an amenable number.

2013981 is a deficient number, since it is larger than the sum of its proper divisors (851619).

2013981 is a wasteful number, since it uses less digits than its factorization.

2013981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508.

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

The square root of 2013981 is about 1419.1479838269. The cubic root of 2013981 is about 126.2850061408.

The spelling of 2013981 in words is "two million, thirteen thousand, nine hundred eighty-one".