5681590921 has 2 divisors, whose sum is σ = 5681590922. Its totient is φ = 5681590920.

The previous prime is 5681590877. The next prime is 5681590951. The reversal of 5681590921 is 1290951865.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5643014400 + 38576521 = 75120^2 + 6211^2 .

It is a cyclic number.

It is not a de Polignac number, because 5681590921 - 2⁷ = 5681590793 is a prime.

It is not a weakly prime, because it can be changed into another prime (5681590951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2840795460 + 2840795461.

It is an arithmetic number, because the mean of its divisors is an integer number (2840795461).

Almost surely, 2^5681590921 is an apocalyptic number.

It is an amenable number.

5681590921 is a deficient number, since it is larger than the sum of its proper divisors (1).

5681590921 is an equidigital number, since it uses as much as digits as its factorization.

5681590921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 46.

The square root of 5681590921 is about 75376.3286516397. The cubic root of 5681590921 is about 1784.3908474933.

The spelling of 5681590921 in words is "five billion, six hundred eighty-one million, five hundred ninety thousand, nine hundred twenty-one".