5131391 has 4 divisors (see below), whose sum is σ = 5142984. Its totient is φ = 5119800.

The previous prime is 5131367. The next prime is 5131417. The reversal of 5131391 is 1931315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1931315 = 5 ⋅386263.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5131391 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 (5131351) 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, 5105 + ... + 6026.

It is an arithmetic number, because the mean of its divisors is an integer number (1285746).

Almost surely, 2^5131391 is an apocalyptic number.

5131391 is a deficient number, since it is larger than the sum of its proper divisors (11593).

5131391 is a wasteful number, since it uses less digits than its factorization.

5131391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11592.

The product of its digits is 405, while the sum is 23.

The square root of 5131391 is about 2265.2573805199. The cubic root of 5131391 is about 172.4824990997.

The spelling of 5131391 in words is "five million, one hundred thirty-one thousand, three hundred ninety-one".