10120661 has 4 divisors (see below), whose sum is σ = 10716012. Its totient is φ = 9525312.

The previous prime is 10120657. The next prime is 10120679. The reversal of 10120661 is 16602101.

10120661 = 529² + 530² + ... + 562².

It is a happy number.

10120661 is digitally balanced in base 3, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 6220036 + 3900625 = 2494^2 + 1975^2 .

It is a cyclic number.

It is not a de Polignac number, because 10120661 - 2² = 10120657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 595333 = 10120661 / (1 + 0 + 1 + 2 + 0 + 6 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10120631) 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, 297650 + ... + 297683.

It is an arithmetic number, because the mean of its divisors is an integer number (2679003).

Almost surely, 2^10120661 is an apocalyptic number.

It is an amenable number.

10120661 is a deficient number, since it is larger than the sum of its proper divisors (595351).

10120661 is an equidigital number, since it uses as much as digits as its factorization.

10120661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595350.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 10120661 is about 3181.2986342058. The cubic root of 10120661 is about 216.3065278176.

Adding to 10120661 its reverse (16602101), we get a palindrome (26722762).

The spelling of 10120661 in words is "ten million, one hundred twenty thousand, six hundred sixty-one".