5261821 has 2 divisors, whose sum is σ = 5261822. Its totient is φ = 5261820.

The previous prime is 5261813. The next prime is 5261827. The reversal of 5261821 is 1281625.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4644025 + 617796 = 2155^2 + 786^2 .

It is a cyclic number.

It is not a de Polignac number, because 5261821 - 2³ = 5261813 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5261827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2630910 + 2630911.

It is an arithmetic number, because the mean of its divisors is an integer number (2630911).

Almost surely, 2^5261821 is an apocalyptic number.

It is an amenable number.

5261821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5261821 is an equidigital number, since it uses as much as digits as its factorization.

5261821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 25.

The square root of 5261821 is about 2293.8659507478. The cubic root of 5261821 is about 173.9316792593.

The spelling of 5261821 in words is "five million, two hundred sixty-one thousand, eight hundred twenty-one".