3618991 has 2 divisors, whose sum is σ = 3618992. Its totient is φ = 3618990.

The previous prime is 3618961. The next prime is 3619013. The reversal of 3618991 is 1998163.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3618991 - 2⁵ = 3618959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3618991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3618961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1809495 + 1809496.

It is an arithmetic number, because the mean of its divisors is an integer number (1809496).

Almost surely, 2^3618991 is an apocalyptic number.

3618991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3618991 is an equidigital number, since it uses as much as digits as its factorization.

3618991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 37.

The square root of 3618991 is about 1902.3645812514. The cubic root of 3618991 is about 153.5309136421.

The spelling of 3618991 in words is "three million, six hundred eighteen thousand, nine hundred ninety-one".