4097991 has 8 divisors (see below), whose sum is σ = 5597424. Its totient is φ = 2665280.

The previous prime is 4097987. The next prime is 4098011. The reversal of 4097991 is 1997904.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4097991 - 2² = 4097987 is a prime.

4097991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4097981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16536 + ... + 16781.

It is an arithmetic number, because the mean of its divisors is an integer number (699678).

Almost surely, 2^4097991 is an apocalyptic number.

4097991 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

4097991 is a deficient number, since it is larger than the sum of its proper divisors (1499433).

4097991 is a wasteful number, since it uses less digits than its factorization.

4097991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33361.

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 4097991 is about 2024.3495251562. The cubic root of 4097991 is about 160.0259202798.

The spelling of 4097991 in words is "four million, ninety-seven thousand, nine hundred ninety-one".