661254 has 32 divisors (see below), whose sum is σ = 1482624. Its totient is φ = 194880.

The previous prime is 661253. The next prime is 661259. The reversal of 661254 is 452166.

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 661254.

It is not an unprimeable number, because it can be changed into a prime (661253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2722 + ... + 2954.

It is an arithmetic number, because the mean of its divisors is an integer number (46332).

2⁶⁶¹²⁵⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (741312).

661254 is an abundant number, since it is smaller than the sum of its proper divisors (821370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661254 is a wasteful number, since it uses less digits than its factorization.

661254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292.

The product of its digits is 1440, while the sum is 24.

The square root of 661254 is about 813.1752578627. The cubic root of 661254 is about 87.1209837475.

It can be divided in two parts, 6612 and 54, that added together give a palindrome (6666).

The spelling of 661254 in words is "six hundred sixty-one thousand, two hundred fifty-four".