3620216581 has 2 divisors, whose sum is σ = 3620216582. Its totient is φ = 3620216580.

The previous prime is 3620216543. The next prime is 3620216609. The reversal of 3620216581 is 1856120263.

3620216581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2444412481 + 1175804100 = 49441^2 + 34290^2 .

It is a cyclic number.

It is not a de Polignac number, because 3620216581 - 2²¹ = 3618119429 is a prime.

It is a super-2 number, since 2×3620216581² = 26211936186694659122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3620226581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1810108290 + 1810108291.

It is an arithmetic number, because the mean of its divisors is an integer number (1810108291).

Almost surely, 2^3620216581 is an apocalyptic number.

It is an amenable number.

3620216581 is a deficient number, since it is larger than the sum of its proper divisors (1).

3620216581 is an equidigital number, since it uses as much as digits as its factorization.

3620216581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 3620216581 is about 60168.2356480560. The cubic root of 3620216581 is about 1535.4824290451.

The spelling of 3620216581 in words is "three billion, six hundred twenty million, two hundred sixteen thousand, five hundred eighty-one".