10621661 has 4 divisors (see below), whose sum is σ = 10715772. Its totient is φ = 10527552.

The previous prime is 10621657. The next prime is 10621673. The reversal of 10621661 is 16612601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16612601 = 23 ⋅722287.

It can be written as a sum of positive squares in 2 ways, for example, as 5359225 + 5262436 = 2315^2 + 2294^2 .

It is a cyclic number.

It is not a de Polignac number, because 10621661 - 2² = 10621657 is a prime.

It is a super-2 number, since 2×10621661² = 225639364797842, which contains 22 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 (10621601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46886 + ... + 47111.

It is an arithmetic number, because the mean of its divisors is an integer number (2678943).

Almost surely, 2^10621661 is an apocalyptic number.

It is an amenable number.

10621661 is a deficient number, since it is larger than the sum of its proper divisors (94111).

10621661 is an equidigital number, since it uses as much as digits as its factorization.

10621661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94110.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 10621661 is about 3259.0889831362. The cubic root of 10621661 is about 219.8184521531.

The spelling of 10621661 in words is "ten million, six hundred twenty-one thousand, six hundred sixty-one".