5131861 has 4 divisors (see below), whose sum is σ = 5864992. Its totient is φ = 4398732.

The previous prime is 5131853. The next prime is 5131871. The reversal of 5131861 is 1681315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1681315 = 5 ⋅336263.

It is a cyclic number.

It is not a de Polignac number, because 5131861 - 2³ = 5131853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5131801) 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, 366555 + ... + 366568.

It is an arithmetic number, because the mean of its divisors is an integer number (1466248).

Almost surely, 2^5131861 is an apocalyptic number.

It is an amenable number.

5131861 is a deficient number, since it is larger than the sum of its proper divisors (733131).

5131861 is an equidigital number, since it uses as much as digits as its factorization.

5131861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733130.

The product of its digits is 720, while the sum is 25.

The square root of 5131861 is about 2265.3611191154. The cubic root of 5131861 is about 172.4877650077.

The spelling of 5131861 in words is "five million, one hundred thirty-one thousand, eight hundred sixty-one".