661293 has 6 divisors (see below), whose sum is σ = 955214. Its totient is φ = 440856.

The previous prime is 661267. The next prime is 661321. The reversal of 661293 is 392166.

It is a happy number.

661293 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 660969 + 324 = 813^2 + 18^2 .

It is not a de Polignac number, because 661293 - 2¹² = 657197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661253) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36730 + ... + 36747.

2⁶⁶¹²⁹³ is an apocalyptic number.

It is an amenable number.

661293 is a deficient number, since it is larger than the sum of its proper divisors (293921).

661293 is a wasteful number, since it uses less digits than its factorization.

661293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73483 (or 73480 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 661293 is about 813.1992375796. The cubic root of 661293 is about 87.1226964790.

The spelling of 661293 in words is "six hundred sixty-one thousand, two hundred ninety-three".