5601987821 has 2 divisors, whose sum is σ = 5601987822. Its totient is φ = 5601987820.

The previous prime is 5601987767. The next prime is 5601987823. The reversal of 5601987821 is 1287891065.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2909415721 + 2692572100 = 53939^2 + 51890^2 .

It is a cyclic number.

It is not a de Polignac number, because 5601987821 - 2⁶ = 5601987757 is a prime.

Together with 5601987823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5601987823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2800993910 + 2800993911.

It is an arithmetic number, because the mean of its divisors is an integer number (2800993911).

Almost surely, 2^5601987821 is an apocalyptic number.

It is an amenable number.

5601987821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5601987821 is an equidigital number, since it uses as much as digits as its factorization.

5601987821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 47.

The square root of 5601987821 is about 74846.4282447733. The cubic root of 5601987821 is about 1776.0180969879.

The spelling of 5601987821 in words is "five billion, six hundred one million, nine hundred eighty-seven thousand, eight hundred twenty-one".