5513981 has 4 divisors (see below), whose sum is σ = 6015264. Its totient is φ = 5012700.

The previous prime is 5513953. The next prime is 5513987. The reversal of 5513981 is 1893155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 5513981 - 2⁶ = 5513917 is a prime.

It is a super-2 number, since 2×5513981² = 60807972936722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5513987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250625 + ... + 250646.

It is an arithmetic number, because the mean of its divisors is an integer number (1503816).

Almost surely, 2^5513981 is an apocalyptic number.

It is an amenable number.

5513981 is a deficient number, since it is larger than the sum of its proper divisors (501283).

5513981 is a wasteful number, since it uses less digits than its factorization.

5513981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501282.

The product of its digits is 5400, while the sum is 32.

The square root of 5513981 is about 2348.1867472584. The cubic root of 5513981 is about 176.6668593012. Note that the first 3 decimals are identical.

The spelling of 5513981 in words is "five million, five hundred thirteen thousand, nine hundred eighty-one".