5605991 has 2 divisors, whose sum is σ = 5605992. Its totient is φ = 5605990.

The previous prime is 5605949. The next prime is 5606011. The reversal of 5605991 is 1995065.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5605991 - 2⁶ = 5605927 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5605891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2802995 + 2802996.

It is an arithmetic number, because the mean of its divisors is an integer number (2802996).

Almost surely, 2^5605991 is an apocalyptic number.

5605991 is a deficient number, since it is larger than the sum of its proper divisors (1).

5605991 is an equidigital number, since it uses as much as digits as its factorization.

5605991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12150, while the sum is 35.

The square root of 5605991 is about 2367.6974046529. The cubic root of 5605991 is about 177.6441043611.

It can be divided in two parts, 5605 and 991, that multiplied together give a palindrome (5554555).

The spelling of 5605991 in words is "five million, six hundred five thousand, nine hundred ninety-one".