661246 has 4 divisors (see below), whose sum is σ = 991872. Its totient is φ = 330622.

The previous prime is 661237. The next prime is 661253. The reversal of 661246 is 642166.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 661246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165310 + ... + 165313.

It is an arithmetic number, because the mean of its divisors is an integer number (247968).

2⁶⁶¹²⁴⁶ is an apocalyptic number.

661246 is a deficient number, since it is larger than the sum of its proper divisors (330626).

661246 is a wasteful number, since it uses less digits than its factorization.

661246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330625.

The product of its digits is 1728, while the sum is 25.

The square root of 661246 is about 813.1703388590. The cubic root of 661246 is about 87.1206324097.

The spelling of 661246 in words is "six hundred sixty-one thousand, two hundred forty-six".