4131981 has 12 divisors (see below), whose sum is σ = 6821152. Its totient is φ = 2361096.

The previous prime is 4131979. The next prime is 4131983. The reversal of 4131981 is 1891314.

It is an interprime number because it is at equal distance from previous prime (4131979) and next prime (4131983).

It is not a de Polignac number, because 4131981 - 2¹ = 4131979 is a prime.

It is a super-2 number, since 2×4131981² = 34146533968722, 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 (4131983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32731 + ... + 32856.

Almost surely, 2^4131981 is an apocalyptic number.

It is an amenable number.

4131981 is a deficient number, since it is larger than the sum of its proper divisors (2689171).

4131981 is a wasteful number, since it uses less digits than its factorization.

4131981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65600 (or 65597 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 4131981 is about 2032.7274780452. The cubic root of 4131981 is about 160.4671374183.

The spelling of 4131981 in words is "four million, one hundred thirty-one thousand, nine hundred eighty-one".