5257981 has 4 divisors (see below), whose sum is σ = 5567292. Its totient is φ = 4948672.

The previous prime is 5257957. The next prime is 5257991. The reversal of 5257981 is 1897525.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2452356 + 2805625 = 1566^2 + 1675^2 .

It is a cyclic number.

It is not a de Polignac number, because 5257981 - 2⁵ = 5257949 is a prime.

It is a super-2 number, since 2×5257981² = 55292728392722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5257981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5257951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154630 + ... + 154663.

It is an arithmetic number, because the mean of its divisors is an integer number (1391823).

Almost surely, 2^5257981 is an apocalyptic number.

It is an amenable number.

5257981 is a deficient number, since it is larger than the sum of its proper divisors (309311).

5257981 is a wasteful number, since it uses less digits than its factorization.

5257981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309310.

The product of its digits is 25200, while the sum is 37.

The square root of 5257981 is about 2293.0287830727. The cubic root of 5257981 is about 173.8893580307.

The spelling of 5257981 in words is "five million, two hundred fifty-seven thousand, nine hundred eighty-one".