5625981 has 6 divisors (see below), whose sum is σ = 8126430. Its totient is φ = 3750648.

The previous prime is 5625967. The next prime is 5626001. The reversal of 5625981 is 1895265.

It is a happy number.

5625981 is a `hidden beast` number, since 5 + 62 + 598 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3348900 + 2277081 = 1830^2 + 1509^2 .

It is a de Polignac number, because none of the positive numbers 2^k-5625981 is a prime.

It is a super-2 number, since 2×5625981² = 63303324424722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5625941) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 312546 + ... + 312563.

It is an arithmetic number, because the mean of its divisors is an integer number (1354405).

Almost surely, 2^5625981 is an apocalyptic number.

It is an amenable number.

5625981 is a deficient number, since it is larger than the sum of its proper divisors (2500449).

5625981 is a wasteful number, since it uses less digits than its factorization.

5625981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625115 (or 625112 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 5625981 is about 2371.9150490690. The cubic root of 5625981 is about 177.8550033267.

The spelling of 5625981 in words is "five million, six hundred twenty-five thousand, nine hundred eighty-one".