10249991 has 4 divisors (see below), whose sum is σ = 10256400. Its totient is φ = 10243584.

The previous prime is 10249979. The next prime is 10250017. The reversal of 10249991 is 19994201.

10249991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10249991 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 (10249951) 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, 1415 + ... + 4743.

It is an arithmetic number, because the mean of its divisors is an integer number (2564100).

Almost surely, 2^10249991 is an apocalyptic number.

10249991 is a deficient number, since it is larger than the sum of its proper divisors (6409).

10249991 is an equidigital number, since it uses as much as digits as its factorization.

10249991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6408.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 10249991 is about 3201.5607131523. The cubic root of 10249991 is about 217.2240107106.

The spelling of 10249991 in words is "ten million, two hundred forty-nine thousand, nine hundred ninety-one".