521951 has 4 divisors (see below), whose sum is σ = 552672. Its totient is φ = 491232.

The previous prime is 521929. The next prime is 521981. The reversal of 521951 is 159125.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 521951 - 2⁶ = 521887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15335 + ... + 15368.

It is an arithmetic number, because the mean of its divisors is an integer number (138168).

2⁵²¹⁹⁵¹ is an apocalyptic number.

521951 is a deficient number, since it is larger than the sum of its proper divisors (30721).

521951 is a wasteful number, since it uses less digits than its factorization.

521951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30720.

The product of its digits is 450, while the sum is 23.

The square root of 521951 is about 722.4617636941. The cubic root of 521951 is about 80.5149593484.

The spelling of 521951 in words is "five hundred twenty-one thousand, nine hundred fifty-one".