5251861 has 4 divisors (see below), whose sum is σ = 5560812. Its totient is φ = 4942912.

The previous prime is 5251859. The next prime is 5251877. The reversal of 5251861 is 1681525.

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 2047761 + 3204100 = 1431^2 + 1790^2 .

It is a cyclic number.

It is not a de Polignac number, because 5251861 - 2¹ = 5251859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5251261) 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, 154450 + ... + 154483.

It is an arithmetic number, because the mean of its divisors is an integer number (1390203).

Almost surely, 2^5251861 is an apocalyptic number.

It is an amenable number.

5251861 is a deficient number, since it is larger than the sum of its proper divisors (308951).

5251861 is a wasteful number, since it uses less digits than its factorization.

5251861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308950.

The product of its digits is 2400, while the sum is 28.

The square root of 5251861 is about 2291.6939149895. The cubic root of 5251861 is about 173.8218659630.

The spelling of 5251861 in words is "five million, two hundred fifty-one thousand, eight hundred sixty-one".