661113 has 24 divisors (see below), whose sum is σ = 1053000. Its totient is φ = 397824.

The previous prime is 661109. The next prime is 661117. The reversal of 661113 is 311166.

661113 is a `hidden beast` number, since 661 + 1 + 1 + 3 = 666.

661113 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (661109) and next prime (661117).

It can be written as a sum of positive squares in 4 ways, for example, as 71289 + 589824 = 267^2 + 768^2 .

It is not a de Polignac number, because 661113 - 2² = 661109 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (661117) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4363 + ... + 4511.

It is an arithmetic number, because the mean of its divisors is an integer number (43875).

2⁶⁶¹¹¹³ is an apocalyptic number.

It is an amenable number.

661113 is a deficient number, since it is larger than the sum of its proper divisors (391887).

661113 is a wasteful number, since it uses less digits than its factorization.

661113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201 (or 198 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 661113 is about 813.0885560626. The cubic root of 661113 is about 87.1147910026.

Adding to 661113 its reverse (311166), we get a palindrome (972279).

The spelling of 661113 in words is "six hundred sixty-one thousand, one hundred thirteen".