10243991 has 8 divisors (see below), whose sum is σ = 10396800. Its totient is φ = 10092600.

The previous prime is 10243969. The next prime is 10244011. The reversal of 10243991 is 19934201.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 10243991 - 2⁶ = 10243927 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 (10243291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26840 + ... + 27218.

It is an arithmetic number, because the mean of its divisors is an integer number (1299600).

Almost surely, 2^10243991 is an apocalyptic number.

10243991 is a deficient number, since it is larger than the sum of its proper divisors (152809).

10243991 is a wasteful number, since it uses less digits than its factorization.

10243991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 10243991 is about 3200.6235330010. The cubic root of 10243991 is about 217.1816172276.

The spelling of 10243991 in words is "ten million, two hundred forty-three thousand, nine hundred ninety-one".