5251439 has 4 divisors (see below), whose sum is σ = 5269656. Its totient is φ = 5233224.

The previous prime is 5251423. The next prime is 5251457. The reversal of 5251439 is 9341525.

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

It is a cyclic number.

It is not a de Polignac number, because 5251439 - 2⁴ = 5251423 is a prime.

It is a super-2 number, since 2×5251439² = 55155223141442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5251409) 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, 8669 + ... + 9254.

It is an arithmetic number, because the mean of its divisors is an integer number (1317414).

Almost surely, 2^5251439 is an apocalyptic number.

5251439 is a deficient number, since it is larger than the sum of its proper divisors (18217).

5251439 is a wasteful number, since it uses less digits than its factorization.

5251439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18216.

The product of its digits is 5400, while the sum is 29.

The square root of 5251439 is about 2291.6018415074. The cubic root of 5251439 is about 173.8172101662.

The spelling of 5251439 in words is "five million, two hundred fifty-one thousand, four hundred thirty-nine".