5813991 has 16 divisors (see below), whose sum is σ = 8652000. Its totient is φ = 3858624.

The previous prime is 5813989. The next prime is 5813993. The reversal of 5813991 is 1993185.

Added to its reverse (1993185) it gives a triangular number (7807176 = T₃₉₅₁).

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (5813989) and next prime (5813993).

It is not a de Polignac number, because 5813991 - 2¹ = 5813989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5813993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9115 + ... + 9731.

It is an arithmetic number, because the mean of its divisors is an integer number (540750).

Almost surely, 2^5813991 is an apocalyptic number.

5813991 is a deficient number, since it is larger than the sum of its proper divisors (2838009).

5813991 is a wasteful number, since it uses less digits than its factorization.

5813991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975 (or 969 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 5813991 is about 2411.2218894162. The cubic root of 5813991 is about 179.8145311841.

Adding to 5813991 its reverse (1993185), we get a triangular number (7807176 = T₃₉₅₁).

The spelling of 5813991 in words is "five million, eight hundred thirteen thousand, nine hundred ninety-one".