6143981 has 8 divisors (see below), whose sum is σ = 6380544. Its totient is φ = 5911920.

The previous prime is 6143957. The next prime is 6143999. The reversal of 6143981 is 1893416.

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 6143981 - 2¹⁰ = 6142957 is a prime.

It is a super-2 number, since 2×6143981² = 75497005056722, 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 (6143941) 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, 1796 + ... + 3938.

It is an arithmetic number, because the mean of its divisors is an integer number (797568).

Almost surely, 2^6143981 is an apocalyptic number.

6143981 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6143981 is a deficient number, since it is larger than the sum of its proper divisors (236563).

6143981 is a wasteful number, since it uses less digits than its factorization.

6143981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251.

The product of its digits is 5184, while the sum is 32.

The square root of 6143981 is about 2478.7055089300. The cubic root of 6143981 is about 183.1540900100.

The spelling of 6143981 in words is "six million, one hundred forty-three thousand, nine hundred eighty-one".