10387561 has 4 divisors (see below), whose sum is σ = 10998612. Its totient is φ = 9776512.

The previous prime is 10387543. The next prime is 10387571. The reversal of 10387561 is 16578301.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7645225 + 2742336 = 2765^2 + 1656^2 .

It is a cyclic number.

It is not a de Polignac number, because 10387561 - 2⁵ = 10387529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10387541) 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, 305500 + ... + 305533.

It is an arithmetic number, because the mean of its divisors is an integer number (2749653).

Almost surely, 2^10387561 is an apocalyptic number.

It is an amenable number.

10387561 is a deficient number, since it is larger than the sum of its proper divisors (611051).

10387561 is an equidigital number, since it uses as much as digits as its factorization.

10387561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611050.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 10387561 is about 3222.9739372201. The cubic root of 10387561 is about 218.1915173035.

The spelling of 10387561 in words is "ten million, three hundred eighty-seven thousand, five hundred sixty-one".