5601651821 has 2 divisors, whose sum is σ = 5601651822. Its totient is φ = 5601651820.

The previous prime is 5601651791. The next prime is 5601651841. The reversal of 5601651821 is 1281561065.

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., 3150015625 + 2451636196 = 56125^2 + 49514^2 .

It is a cyclic number.

It is not a de Polignac number, because 5601651821 - 2¹⁰ = 5601650797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5601651841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2800825910 + 2800825911.

It is an arithmetic number, because the mean of its divisors is an integer number (2800825911).

Almost surely, 2^5601651821 is an apocalyptic number.

It is an amenable number.

5601651821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5601651821 is an equidigital number, since it uses as much as digits as its factorization.

5601651821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 5601651821 is about 74844.1836150278. The cubic root of 5601651821 is about 1775.9825885202.

The spelling of 5601651821 in words is "five billion, six hundred one million, six hundred fifty-one thousand, eight hundred twenty-one".