5409981 has 12 divisors (see below), whose sum is σ = 7896252. Its totient is φ = 3568896.

The previous prime is 5409977. The next prime is 5410007. The reversal of 5409981 is 1899045.

5409981 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2277081 + 3132900 = 1509^2 + 1770^2 .

It is not a de Polignac number, because 5409981 - 2² = 5409977 is a prime.

It is a super-2 number, since 2×5409981² = 58535788840722, which contains 22 as substring.

5409981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5409931) 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, 2226 + ... + 3971.

It is an arithmetic number, because the mean of its divisors is an integer number (658021).

Almost surely, 2^5409981 is an apocalyptic number.

It is an amenable number.

5409981 is a deficient number, since it is larger than the sum of its proper divisors (2486271).

5409981 is a wasteful number, since it uses less digits than its factorization.

5409981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6300 (or 6297 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 5409981 is about 2325.9365855500. The cubic root of 5409981 is about 175.5490889539.

The spelling of 5409981 in words is "five million, four hundred nine thousand, nine hundred eighty-one".