5909991 has 4 divisors (see below), whose sum is σ = 7879992. Its totient is φ = 3939992.

The previous prime is 5909987. The next prime is 5909993. The reversal of 5909991 is 1999095.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 5909991 - 2² = 5909987 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5909993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 984996 + ... + 985001.

It is an arithmetic number, because the mean of its divisors is an integer number (1969998).

Almost surely, 2^5909991 is an apocalyptic number.

5909991 is a deficient number, since it is larger than the sum of its proper divisors (1970001).

5909991 is a wasteful number, since it uses less digits than its factorization.

5909991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1970000.

The product of its (nonzero) digits is 32805, while the sum is 42.

The square root of 5909991 is about 2431.0473051753. The cubic root of 5909991 is about 180.7988261697.

The spelling of 5909991 in words is "five million, nine hundred nine thousand, nine hundred ninety-one".