5620761821 has 2 divisors, whose sum is σ = 5620761822. Its totient is φ = 5620761820.

The previous prime is 5620761761. The next prime is 5620761823. The reversal of 5620761821 is 1281670265.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5279620921 + 341140900 = 72661^2 + 18470^2 .

It is a cyclic number.

It is not a de Polignac number, because 5620761821 - 2¹⁴ = 5620745437 is a prime.

It is a super-2 number, since 2×5620761821² = 63185926896822472082, which contains 22 as substring.

Together with 5620761823, 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 (5620761823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2810380910 + 2810380911.

It is an arithmetic number, because the mean of its divisors is an integer number (2810380911).

Almost surely, 2^5620761821 is an apocalyptic number.

It is an amenable number.

5620761821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5620761821 is an equidigital number, since it uses as much as digits as its factorization.

5620761821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 5620761821 is about 74971.7401492056. The cubic root of 5620761821 is about 1777.9998807447. Note that the first 3 decimals are identical.

The spelling of 5620761821 in words is "five billion, six hundred twenty million, seven hundred sixty-one thousand, eight hundred twenty-one".