661095 has 32 divisors (see below), whose sum is σ = 1209600. Its totient is φ = 342432.

The previous prime is 661093. The next prime is 661097. The reversal of 661095 is 590166.

661095 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (661093) and next prime (661097).

It is not a de Polignac number, because 661095 - 2¹ = 661093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

661095 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7924 + ... + 8006.

It is an arithmetic number, because the mean of its divisors is an integer number (37800).

2⁶⁶¹⁰⁹⁵ is an apocalyptic number.

661095 is a deficient number, since it is larger than the sum of its proper divisors (548505).

661095 is a wasteful number, since it uses less digits than its factorization.

661095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 661095 is about 813.0774870823. The cubic root of 661095 is about 87.1140003761.

The spelling of 661095 in words is "six hundred sixty-one thousand, ninety-five".