661125 has 32 divisors (see below), whose sum is σ = 1153152. Its totient is φ = 336000.

The previous prime is 661121. The next prime is 661139. The reversal of 661125 is 521166.

It is a happy number.

661125 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 661125 - 2² = 661121 is a prime.

661125 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15354 + ... + 15396.

It is an arithmetic number, because the mean of its divisors is an integer number (36036).

2⁶⁶¹¹²⁵ is an apocalyptic number.

It is an amenable number.

661125 is a deficient number, since it is larger than the sum of its proper divisors (492027).

661125 is a wasteful number, since it uses less digits than its factorization.

661125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 92 counting only the distinct ones).

The product of its digits is 360, while the sum is 21.

The square root of 661125 is about 813.0959352992. The cubic root of 661125 is about 87.1153180790.

The spelling of 661125 in words is "six hundred sixty-one thousand, one hundred twenty-five".