5121639 has 6 divisors (see below), whose sum is σ = 7397936. Its totient is φ = 3414420.

The previous prime is 5121631. The next prime is 5121643. The reversal of 5121639 is 9361215.

5121639 is a `hidden beast` number, since 5 + 1 + 21 + 639 = 666.

It is not a de Polignac number, because 5121639 - 2³ = 5121631 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 (5121631) 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, 284527 + ... + 284544.

Almost surely, 2^5121639 is an apocalyptic number.

5121639 is a deficient number, since it is larger than the sum of its proper divisors (2276297).

5121639 is a wasteful number, since it uses less digits than its factorization.

5121639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569077 (or 569074 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 5121639 is about 2263.1038420718. The cubic root of 5121639 is about 172.3731644824.

The spelling of 5121639 in words is "five million, one hundred twenty-one thousand, six hundred thirty-nine".