6261991 has 4 divisors (see below), whose sum is σ = 6431272. Its totient is φ = 6092712.

The previous prime is 6261977. The next prime is 6262007. The reversal of 6261991 is 1991626.

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 6261991 - 2⁷ = 6261863 is a prime.

It is a Duffinian number.

6261991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6261901) 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, 84585 + ... + 84658.

It is an arithmetic number, because the mean of its divisors is an integer number (1607818).

Almost surely, 2^6261991 is an apocalyptic number.

6261991 is a deficient number, since it is larger than the sum of its proper divisors (169281).

6261991 is a wasteful number, since it uses less digits than its factorization.

6261991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169280.

The product of its digits is 5832, while the sum is 34.

The square root of 6261991 is about 2502.3970508295. The cubic root of 6261991 is about 184.3193002676.

The spelling of 6261991 in words is "six million, two hundred sixty-one thousand, nine hundred ninety-one".