5633991 has 12 divisors (see below), whose sum is σ = 8877960. Its totient is φ = 3414480.

The previous prime is 5633981. The next prime is 5634001. The reversal of 5633991 is 1993365.

5633991 is a `hidden beast` number, since 563 + 3 + 9 + 91 = 666.

It is an interprime number because it is at equal distance from previous prime (5633981) and next prime (5634001).

It is not a de Polignac number, because 5633991 - 2⁵ = 5633959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5633981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28356 + ... + 28553.

It is an arithmetic number, because the mean of its divisors is an integer number (739830).

Almost surely, 2^5633991 is an apocalyptic number.

5633991 is a deficient number, since it is larger than the sum of its proper divisors (3243969).

5633991 is a wasteful number, since it uses less digits than its factorization.

5633991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56926 (or 56923 counting only the distinct ones).

The product of its digits is 21870, while the sum is 36.

The square root of 5633991 is about 2373.6029575310. The cubic root of 5633991 is about 177.9393704211.

It can be divided in two parts, 563 and 3991, that added together give a palindrome (4554).

The spelling of 5633991 in words is "five million, six hundred thirty-three thousand, nine hundred ninety-one".