661941 has 36 divisors (see below), whose sum is σ = 1185600. Its totient is φ = 353808.

The previous prime is 661939. The next prime is 661949. The reversal of 661941 is 149166.

661941 is a `hidden beast` number, since 6 + 619 + 41 = 666.

661941 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 661941 - 2¹ = 661939 is a prime.

Its product of digits (1296) is a multiple of the sum of its prime divisors (108).

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661949) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8340 + ... + 8418.

2⁶⁶¹⁹⁴¹ is an apocalyptic number.

It is an amenable number.

661941 is a deficient number, since it is larger than the sum of its proper divisors (523659).

661941 is a wasteful number, since it uses less digits than its factorization.

661941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118 (or 108 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 661941 is about 813.5975663680. The cubic root of 661941 is about 87.1511443214.

The spelling of 661941 in words is "six hundred sixty-one thousand, nine hundred forty-one".