561498 has 32 divisors (see below), whose sum is σ = 1330560. Its totient is φ = 154560.

The previous prime is 561461. The next prime is 561521. The reversal of 561498 is 894165.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 988 + ... + 1448.

It is an arithmetic number, because the mean of its divisors is an integer number (41580).

2⁵⁶¹⁴⁹⁸ is an apocalyptic number.

561498 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 561498, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (665280).

561498 is an abundant number, since it is smaller than the sum of its proper divisors (769062).

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

561498 is a wasteful number, since it uses less digits than its factorization.

561498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502.

The product of its digits is 8640, while the sum is 33.

The square root of 561498 is about 749.3317022521. The cubic root of 561498 is about 82.4991368137.

It can be divided in two parts, 561 and 498, that multiplied together give a triangular number (279378 = T₇₄₇).

The spelling of 561498 in words is "five hundred sixty-one thousand, four hundred ninety-eight".