10971661 has 4 divisors (see below), whose sum is σ = 10978300. Its totient is φ = 10965024.

The previous prime is 10971659. The next prime is 10971679. The reversal of 10971661 is 16617901.

10971661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16617901 = 487 ⋅34123.

It can be written as a sum of positive squares in 2 ways, for example, as 1454436 + 9517225 = 1206^2 + 3085^2 .

It is a cyclic number.

It is not a de Polignac number, because 10971661 - 2¹ = 10971659 is a prime.

It is a super-3 number, since 3×10971661³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10971601) 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, 1345 + ... + 4873.

It is an arithmetic number, because the mean of its divisors is an integer number (2744575).

Almost surely, 2^10971661 is an apocalyptic number.

It is an amenable number.

10971661 is a deficient number, since it is larger than the sum of its proper divisors (6639).

10971661 is an equidigital number, since it uses as much as digits as its factorization.

10971661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6638.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 10971661 is about 3312.3497701783. The cubic root of 10971661 is about 222.2068588360.

The spelling of 10971661 in words is "ten million, nine hundred seventy-one thousand, six hundred sixty-one".