6201991 has 8 divisors (see below), whose sum is σ = 6629040. Its totient is φ = 5781888.

The previous prime is 6201983. The next prime is 6202013. The reversal of 6201991 is 1991026.

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 6201991 - 2³ = 6201983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6201941) 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, 180 + ... + 3526.

It is an arithmetic number, because the mean of its divisors is an integer number (828630).

Almost surely, 2^6201991 is an apocalyptic number.

6201991 is a deficient number, since it is larger than the sum of its proper divisors (427049).

6201991 is a wasteful number, since it uses less digits than its factorization.

6201991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3473.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 6201991 is about 2490.3796899268. The cubic root of 6201991 is about 183.7287176672.

The spelling of 6201991 in words is "six million, two hundred one thousand, nine hundred ninety-one".