5901821 has 2 divisors, whose sum is σ = 5901822. Its totient is φ = 5901820.

The previous prime is 5901781. The next prime is 5901851. The reversal of 5901821 is 1281095.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5244100 + 657721 = 2290^2 + 811^2 .

It is a cyclic number.

It is not a de Polignac number, because 5901821 - 2⁶ = 5901757 is a prime.

It is a super-2 number, since 2×5901821² = 69662982232082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5901851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2950910 + 2950911.

It is an arithmetic number, because the mean of its divisors is an integer number (2950911).

Almost surely, 2^5901821 is an apocalyptic number.

It is an amenable number.

5901821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5901821 is an equidigital number, since it uses as much as digits as its factorization.

5901821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 5901821 is about 2429.3663782970. The cubic root of 5901821 is about 180.7154753606.

The spelling of 5901821 in words is "five million, nine hundred one thousand, eight hundred twenty-one".