5021391 has 4 divisors (see below), whose sum is σ = 6695192. Its totient is φ = 3347592.

The previous prime is 5021369. The next prime is 5021407. The reversal of 5021391 is 1931205.

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

It is not a de Polignac number, because 5021391 - 2⁶ = 5021327 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5021351) 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, 836896 + ... + 836901.

It is an arithmetic number, because the mean of its divisors is an integer number (1673798).

Almost surely, 2^5021391 is an apocalyptic number.

5021391 is a deficient number, since it is larger than the sum of its proper divisors (1673801).

5021391 is a wasteful number, since it uses less digits than its factorization.

5021391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1673800.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 5021391 is about 2240.8460455819. The cubic root of 5021391 is about 171.2411017097.

Adding to 5021391 its reverse (1931205), we get a palindrome (6952596).

The spelling of 5021391 in words is "five million, twenty-one thousand, three hundred ninety-one".