521154 has 20 divisors (see below), whose sum is σ = 1168134. Its totient is φ = 173664.

The previous prime is 521153. The next prime is 521161. The reversal of 521154 is 451125.

It can be written as a sum of positive squares in only one way, i.e., 342225 + 178929 = 585^2 + 423^2 .

It is a hoax number, since the sum of its digits (18) 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 (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (521153) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1447 + ... + 1770.

2⁵²¹¹⁵⁴ is an apocalyptic number.

521154 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

521154 is an abundant number, since it is smaller than the sum of its proper divisors (646980).

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

521154 is a wasteful number, since it uses less digits than its factorization.

521154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3231 (or 3222 counting only the distinct ones).

The product of its digits is 200, while the sum is 18.

The square root of 521154 is about 721.9099666856. The cubic root of 521154 is about 80.4739573436.

Adding to 521154 its reverse (451125), we get a palindrome (972279).

The spelling of 521154 in words is "five hundred twenty-one thousand, one hundred fifty-four".