10391561 has 8 divisors (see below), whose sum is σ = 11137344. Its totient is φ = 9670320.

The previous prime is 10391531. The next prime is 10391597. The reversal of 10391561 is 16519301.

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

It is not a de Polignac number, because 10391561 - 2¹⁴ = 10375177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10391561.

It is not an unprimeable number, because it can be changed into a prime (10391531) 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, 5255 + ... + 6956.

It is an arithmetic number, because the mean of its divisors is an integer number (1392168).

Almost surely, 2^10391561 is an apocalyptic number.

It is an amenable number.

10391561 is a deficient number, since it is larger than the sum of its proper divisors (745783).

10391561 is a wasteful number, since it uses less digits than its factorization.

10391561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12271.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 10391561 is about 3223.5944223801. The cubic root of 10391561 is about 218.2195204785.

The spelling of 10391561 in words is "ten million, three hundred ninety-one thousand, five hundred sixty-one".