2361981 has 8 divisors (see below), whose sum is σ = 3201184. Its totient is φ = 1548720.

The previous prime is 2361977. The next prime is 2361991. The reversal of 2361981 is 1891632.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2361981 - 2² = 2361977 is a prime.

It is a super-2 number, since 2×2361981² = 11157908488722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2361911) 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, 6271 + ... + 6636.

It is an arithmetic number, because the mean of its divisors is an integer number (400148).

2^2361981 is an apocalyptic number.

It is an amenable number.

2361981 is a deficient number, since it is larger than the sum of its proper divisors (839203).

2361981 is a wasteful number, since it uses less digits than its factorization.

2361981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12971.

The product of its digits is 2592, while the sum is 30.

The square root of 2361981 is about 1536.8737749080. The cubic root of 2361981 is about 133.1758466968.

The spelling of 2361981 in words is "two million, three hundred sixty-one thousand, nine hundred eighty-one".