661349 has 4 divisors (see below), whose sum is σ = 712236. Its totient is φ = 610464.

The previous prime is 661343. The next prime is 661361. The reversal of 661349 is 943166.

661349 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 232324 + 429025 = 482^2 + 655^2 .

It is a cyclic number.

It is not a de Polignac number, because 661349 - 2⁸ = 661093 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 (661343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25424 + ... + 25449.

It is an arithmetic number, because the mean of its divisors is an integer number (178059).

2⁶⁶¹³⁴⁹ is an apocalyptic number.

It is an amenable number.

661349 is a deficient number, since it is larger than the sum of its proper divisors (50887).

661349 is a wasteful number, since it uses less digits than its factorization.

661349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50886.

The product of its digits is 3888, while the sum is 29.

The square root of 661349 is about 813.2336687570. The cubic root of 661349 is about 87.1251556679.

The spelling of 661349 in words is "six hundred sixty-one thousand, three hundred forty-nine".