10957991 has 8 divisors (see below), whose sum is σ = 12232704. Its totient is φ = 9729720.

The previous prime is 10957967. The next prime is 10958009. The reversal of 10957991 is 19975901.

It is a happy number.

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

It is not a de Polignac number, because 10957991 - 2¹⁴ = 10941607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10957901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11111 + ... + 12056.

It is an arithmetic number, because the mean of its divisors is an integer number (1529088).

Almost surely, 2^10957991 is an apocalyptic number.

10957991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

10957991 is a deficient number, since it is larger than the sum of its proper divisors (1274713).

10957991 is a wasteful number, since it uses less digits than its factorization.

10957991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23221.

The product of its (nonzero) digits is 25515, while the sum is 41.

The square root of 10957991 is about 3310.2856372223. The cubic root of 10957991 is about 222.1145352224.

The spelling of 10957991 in words is "ten million, nine hundred fifty-seven thousand, nine hundred ninety-one".