3618877421 has 2 divisors, whose sum is σ = 3618877422. Its totient is φ = 3618877420.

The previous prime is 3618877417. The next prime is 3618877429. The reversal of 3618877421 is 1247788163.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3032704900 + 586172521 = 55070^2 + 24211^2 .

It is a cyclic number.

It is not a de Polignac number, because 3618877421 - 2² = 3618877417 is a prime.

It is a super-2 number, since 2×3618877421² = 26192547576447222482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3618877429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1809438710 + 1809438711.

It is an arithmetic number, because the mean of its divisors is an integer number (1809438711).

Almost surely, 2^3618877421 is an apocalyptic number.

It is an amenable number.

3618877421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3618877421 is an equidigital number, since it uses as much as digits as its factorization.

3618877421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 451584, while the sum is 47.

The square root of 3618877421 is about 60157.1061554660. The cubic root of 3618877421 is about 1535.2930747896.

The spelling of 3618877421 in words is "three billion, six hundred eighteen million, eight hundred seventy-seven thousand, four hundred twenty-one".