3178981 has 8 divisors (see below), whose sum is σ = 3460184. Its totient is φ = 2903040.

The previous prime is 3178963. The next prime is 3178997. The reversal of 3178981 is 1898713.

3178981 = 36³ + 37³ + ... + 61³.

3178981 is a nontrivial binomial coefficient, being equal to C(2522, 2).

It can be written as a sum of positive squares in 4 ways, for example, as 133956 + 3045025 = 366^2 + 1745^2 .

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

It is a 5-Lehmer number, since φ(3178981) divides (3178981-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 3178981 - 2¹⁷ = 3047909 is a prime.

It is a super-2 number, since 2×3178981² = 20211840396722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3178981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3178961) 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, 1 + ... + 2521.

It is an arithmetic number, because the mean of its divisors is an integer number (432523).

Almost surely, 2^3178981 is an apocalyptic number.

3178981 is the 2521-st triangular number and also the 1261-st hexagonal number.

3178981 is the 841-st centered nonagonal number.

It is an amenable number.

3178981 is a deficient number, since it is larger than the sum of its proper divisors (281203).

3178981 is a wasteful number, since it uses less digits than its factorization.

3178981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2631.

The product of its digits is 12096, while the sum is 37.

The square root of 3178981 is about 1782.9697137080. The cubic root of 3178981 is about 147.0379065246.

The spelling of 3178981 in words is "three million, one hundred seventy-eight thousand, nine hundred eighty-one".