661149 has 16 divisors (see below), whose sum is σ = 1002240. Its totient is φ = 430560.

The previous prime is 661139. The next prime is 661183. The reversal of 661149 is 941166.

661149 is a `hidden beast` number, since 6 + 611 + 49 = 666.

661149 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 661149 - 2⁵ = 661117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1009 + ... + 1529.

It is an arithmetic number, because the mean of its divisors is an integer number (62640).

2⁶⁶¹¹⁴⁹ is an apocalyptic number.

It is an amenable number.

661149 is a deficient number, since it is larger than the sum of its proper divisors (341091).

661149 is a wasteful number, since it uses less digits than its factorization.

661149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577 (or 571 counting only the distinct ones).

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

The square root of 661149 is about 813.1106935713. The cubic root of 661149 is about 87.1163722127.

It can be divided in two parts, 661 and 149, that multiplied together give a palindrome (98489).

The spelling of 661149 in words is "six hundred sixty-one thousand, one hundred forty-nine".