5261891 has 4 divisors (see below), whose sum is σ = 5571432. Its totient is φ = 4952352.

The previous prime is 5261887. The next prime is 5261923. The reversal of 5261891 is 1981625.

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 5261891 - 2² = 5261887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5261801) 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, 154745 + ... + 154778.

It is an arithmetic number, because the mean of its divisors is an integer number (1392858).

Almost surely, 2^5261891 is an apocalyptic number.

5261891 is a deficient number, since it is larger than the sum of its proper divisors (309541).

5261891 is a wasteful number, since it uses less digits than its factorization.

5261891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309540.

The product of its digits is 4320, while the sum is 32.

The square root of 5261891 is about 2293.8812087813. The cubic root of 5261891 is about 173.9324505489.

The spelling of 5261891 in words is "five million, two hundred sixty-one thousand, eight hundred ninety-one".