3587621981 has 2 divisors, whose sum is σ = 3587621982. Its totient is φ = 3587621980.

The previous prime is 3587621969. The next prime is 3587622007. The reversal of 3587621981 is 1891267853.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3040529881 + 547092100 = 55141^2 + 23390^2 .

It is an emirp because it is prime and its reverse (1891267853) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3587621981 - 2¹⁴ = 3587605597 is a prime.

It is a super-2 number, since 2×3587621981² = 25742062957108728722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3587621941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1793810990 + 1793810991.

It is an arithmetic number, because the mean of its divisors is an integer number (1793810991).

Almost surely, 2^3587621981 is an apocalyptic number.

It is an amenable number.

3587621981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3587621981 is an equidigital number, since it uses as much as digits as its factorization.

3587621981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 50.

The square root of 3587621981 is about 59896.7610226129. The cubic root of 3587621981 is about 1530.8602935170.

The spelling of 3587621981 in words is "three billion, five hundred eighty-seven million, six hundred twenty-one thousand, nine hundred eighty-one".