3601981 has 8 divisors (see below), whose sum is σ = 3712544. Its totient is φ = 3492720.

The previous prime is 3601967. The next prime is 3601991. The reversal of 3601981 is 1891063.

It is a happy number.

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 3601981 - 2¹¹ = 3599933 is a prime.

It is a super-2 number, since 2×3601981² = 25948534248722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3601931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8875 + ... + 9271.

It is an arithmetic number, because the mean of its divisors is an integer number (464068).

Almost surely, 2^3601981 is an apocalyptic number.

It is an amenable number.

3601981 is a deficient number, since it is larger than the sum of its proper divisors (110563).

3601981 is a wasteful number, since it uses less digits than its factorization.

3601981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 3601981 is about 1897.8885636412. Note that the first 3 decimals coincide. The cubic root of 3601981 is about 153.2899935272.

It can be divided in two parts, 36019 and 81, that added together give a square (36100 = 190²).

The spelling of 3601981 in words is "three million, six hundred one thousand, nine hundred eighty-one".