3613991 has 2 divisors, whose sum is σ = 3613992. Its totient is φ = 3613990.

The previous prime is 3613963. The next prime is 3613993. The reversal of 3613991 is 1993163.

It is a strong prime.

It is an emirp because it is prime and its reverse (1993163) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3613991 - 2¹⁰ = 3612967 is a prime.

Together with 3613993, 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 (3613993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1806995 + 1806996.

It is an arithmetic number, because the mean of its divisors is an integer number (1806996).

Almost surely, 2^3613991 is an apocalyptic number.

3613991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3613991 is an equidigital number, since it uses as much as digits as its factorization.

3613991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4374, while the sum is 32.

The square root of 3613991 is about 1901.0499730412. The cubic root of 3613991 is about 153.4601749224.

The spelling of 3613991 in words is "three million, six hundred thirteen thousand, nine hundred ninety-one".