10001391 has 8 divisors (see below), whose sum is σ = 14037120. Its totient is φ = 6316632.

The previous prime is 10001363. The next prime is 10001399. The reversal of 10001391 is 19310001.

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

It is a de Polignac number, because none of the positive numbers 2^k-10001391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10001391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001399) 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, 87675 + ... + 87788.

It is an arithmetic number, because the mean of its divisors is an integer number (1754640).

Almost surely, 2^10001391 is an apocalyptic number.

10001391 is a deficient number, since it is larger than the sum of its proper divisors (4035729).

10001391 is a wasteful number, since it uses less digits than its factorization.

10001391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175485.

The product of its (nonzero) digits is 27, while the sum is 15.

The square root of 10001391 is about 3162.4975889319. The cubic root of 10001391 is about 215.4534579356.

Adding to 10001391 its reverse (19310001), we get a palindrome (29311392).

The spelling of 10001391 in words is "ten million, one thousand, three hundred ninety-one".