521694 has 16 divisors (see below), whose sum is σ = 1159440. Its totient is φ = 173880.

The previous prime is 521693. The next prime is 521707. The reversal of 521694 is 496125.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

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

It is a zygodrome in base 3.

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 521694.

It is not an unprimeable number, because it can be changed into a prime (521693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4777 + ... + 4884.

It is an arithmetic number, because the mean of its divisors is an integer number (72465).

2⁵²¹⁶⁹⁴ is an apocalyptic number.

521694 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

521694 is an abundant number, since it is smaller than the sum of its proper divisors (637746).

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

521694 is a wasteful number, since it uses less digits than its factorization.

521694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9672 (or 9666 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 521694 is about 722.2838777101. The cubic root of 521694 is about 80.5017424362.

It can be divided in two parts, 52 and 1694, that multiplied together give a palindrome (88088).

The spelling of 521694 in words is "five hundred twenty-one thousand, six hundred ninety-four".