10561691 has 4 divisors (see below), whose sum is σ = 12070512. Its totient is φ = 9052872.

The previous prime is 10561643. The next prime is 10561693. The reversal of 10561691 is 19616501.

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

It is a cyclic number.

It is not a de Polignac number, because 10561691 - 2¹⁸ = 10299547 is a prime.

It is a super-2 number, since 2×10561691² = 223098633558962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10561693) 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, 754400 + ... + 754413.

It is an arithmetic number, because the mean of its divisors is an integer number (3017628).

Almost surely, 2^10561691 is an apocalyptic number.

10561691 is a deficient number, since it is larger than the sum of its proper divisors (1508821).

10561691 is an equidigital number, since it uses as much as digits as its factorization.

10561691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508820.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 10561691 is about 3249.8755360783. The cubic root of 10561691 is about 219.4039720883.

The spelling of 10561691 in words is "ten million, five hundred sixty-one thousand, six hundred ninety-one".