661119 has 4 divisors (see below), whose sum is σ = 881496. Its totient is φ = 440744.

The previous prime is 661117. The next prime is 661121. The reversal of 661119 is 911166.

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

It is an interprime number because it is at equal distance from previous prime (661117) and next prime (661121).

It is a cyclic number.

It is not a de Polignac number, because 661119 - 2¹ = 661117 is a prime.

It is a super-2 number, since 2×661119² = 874156664322, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661117) 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, 110184 + ... + 110189.

It is an arithmetic number, because the mean of its divisors is an integer number (220374).

2⁶⁶¹¹¹⁹ is an apocalyptic number.

661119 is a deficient number, since it is larger than the sum of its proper divisors (220377).

661119 is a wasteful number, since it uses less digits than its factorization.

661119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220376.

The product of its digits is 324, while the sum is 24.

The square root of 661119 is about 813.0922456893. The cubic root of 661119 is about 87.1150545416.

Subtracting 661119 from its reverse (911166), we obtain a cube (250047 = 63³).

It can be divided in two parts, 661 and 119, that added together give a triangular number (780 = T₃₉).

The spelling of 661119 in words is "six hundred sixty-one thousand, one hundred nineteen".