5631994 has 4 divisors (see below), whose sum is σ = 8447994. Its totient is φ = 2815996.

The previous prime is 5631991. The next prime is 5632001. The reversal of 5631994 is 4991365.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4991365 = 5 ⋅998273.

It can be written as a sum of positive squares in only one way, i.e., 4223025 + 1408969 = 2055^2 + 1187^2 .

It is not an unprimeable number, because it can be changed into a prime (5631991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1407997 + ... + 1408000.

Almost surely, 2^5631994 is an apocalyptic number.

5631994 is a deficient number, since it is larger than the sum of its proper divisors (2816000).

5631994 is a wasteful number, since it uses less digits than its factorization.

5631994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2815999.

The product of its digits is 29160, while the sum is 37.

The square root of 5631994 is about 2373.1822517455. The cubic root of 5631994 is about 177.9183440643.

The spelling of 5631994 in words is "five million, six hundred thirty-one thousand, nine hundred ninety-four".