10210991 has 4 divisors (see below), whose sum is σ = 11669712. Its totient is φ = 8752272.

The previous prime is 10210957. The next prime is 10211027. The reversal of 10210991 is 19901201.

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 10210991 - 2¹⁴ = 10194607 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 (10210901) 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, 729350 + ... + 729363.

It is an arithmetic number, because the mean of its divisors is an integer number (2917428).

Almost surely, 2^10210991 is an apocalyptic number.

10210991 is a deficient number, since it is larger than the sum of its proper divisors (1458721).

10210991 is an equidigital number, since it uses as much as digits as its factorization.

10210991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458720.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 10210991 is about 3195.4641290429. The cubic root of 10210991 is about 216.9481566851.

The spelling of 10210991 in words is "ten million, two hundred ten thousand, nine hundred ninety-one".