10571991 has 4 divisors (see below), whose sum is σ = 14095992. Its totient is φ = 7047992.

The previous prime is 10571989. The next prime is 10571993. The reversal of 10571991 is 19917501.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (10571989) and next prime (10571993).

It is a cyclic number.

It is not a de Polignac number, because 10571991 - 2¹ = 10571989 is a prime.

It is a super-2 number, since 2×10571991² = 223533987408162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10571993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1761996 + ... + 1762001.

It is an arithmetic number, because the mean of its divisors is an integer number (3523998).

Almost surely, 2^10571991 is an apocalyptic number.

10571991 is a deficient number, since it is larger than the sum of its proper divisors (3524001).

10571991 is an equidigital number, since it uses as much as digits as its factorization.

10571991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3524000.

The product of its (nonzero) digits is 2835, while the sum is 33.

The square root of 10571991 is about 3251.4598259859. The cubic root of 10571991 is about 219.4752714881.

The spelling of 10571991 in words is "ten million, five hundred seventy-one thousand, nine hundred ninety-one".