661142 has 8 divisors (see below), whose sum is σ = 1026000. Its totient is φ = 319144.

The previous prime is 661139. The next prime is 661183. The reversal of 661142 is 241166.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 661142.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5642 + ... + 5757.

It is an arithmetic number, because the mean of its divisors is an integer number (128250).

2⁶⁶¹¹⁴² is an apocalyptic number.

661142 is a deficient number, since it is larger than the sum of its proper divisors (364858).

661142 is a wasteful number, since it uses less digits than its factorization.

661142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11430.

The product of its digits is 288, while the sum is 20.

The square root of 661142 is about 813.1063891029. The cubic root of 661142 is about 87.1160647597.

The spelling of 661142 in words is "six hundred sixty-one thousand, one hundred forty-two".