521654 has 12 divisors (see below), whose sum is σ = 910404. Its totient is φ = 223524.

The previous prime is 521641. The next prime is 521657. The reversal of 521654 is 456125.

It is an Ulam number.

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

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 521654.

It is not an unprimeable number, because it can be changed into a prime (521657) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2564 + ... + 2759.

It is an arithmetic number, because the mean of its divisors is an integer number (75867).

2⁵²¹⁶⁵⁴ is an apocalyptic number.

521654 is a deficient number, since it is larger than the sum of its proper divisors (388750).

521654 is a wasteful number, since it uses less digits than its factorization.

521654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5339 (or 5332 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 521654 is about 722.2561872355. The cubic root of 521654 is about 80.4996849389.

Adding to 521654 its reverse (456125), we get a palindrome (977779).

The spelling of 521654 in words is "five hundred twenty-one thousand, six hundred fifty-four".