661037 has 4 divisors (see below), whose sum is σ = 711900. Its totient is φ = 610176.

The previous prime is 661027. The next prime is 661049. The reversal of 661037 is 730166.

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 259081 + 401956 = 509^2 + 634^2 .

It is a cyclic number.

It is not a de Polignac number, because 661037 - 2⁶ = 660973 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 (661027) 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, 25412 + ... + 25437.

It is an arithmetic number, because the mean of its divisors is an integer number (177975).

2⁶⁶¹⁰³⁷ is an apocalyptic number.

It is an amenable number.

661037 is a deficient number, since it is larger than the sum of its proper divisors (50863).

661037 is a wasteful number, since it uses less digits than its factorization.

661037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50862.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 661037 is about 813.0418193426. The cubic root of 661037 is about 87.1114527040. Note that the first 3 decimals are identical.

The spelling of 661037 in words is "six hundred sixty-one thousand, thirty-seven".