661190 has 16 divisors (see below), whose sum is σ = 1222992. Its totient is φ = 257184.

The previous prime is 661189. The next prime is 661201. The reversal of 661190 is 91166.

It is a super-2 number, since 2×661190² = 874344432200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 524 + ... + 1263.

It is an arithmetic number, because the mean of its divisors is an integer number (76437).

2⁶⁶¹¹⁹⁰ is an apocalyptic number.

661190 is a deficient number, since it is larger than the sum of its proper divisors (561802).

661190 is a wasteful number, since it uses less digits than its factorization.

661190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 661190 is about 813.1359049999. The cubic root of 661190 is about 87.1181729653.

The spelling of 661190 in words is "six hundred sixty-one thousand, one hundred ninety".