521672111 has 4 divisors (see below), whose sum is σ = 527050272. Its totient is φ = 516293952.

The previous prime is 521672101. The next prime is 521672119. The reversal of 521672111 is 111276125.

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

It is a cyclic number.

It is not a de Polignac number, because 521672111 - 2²⁶ = 454563247 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 (521672119) 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, 2688935 + ... + 2689128.

It is an arithmetic number, because the mean of its divisors is an integer number (131762568).

Almost surely, 2^521672111 is an apocalyptic number.

521672111 is a deficient number, since it is larger than the sum of its proper divisors (5378161).

521672111 is an equidigital number, since it uses as much as digits as its factorization.

521672111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5378160.

The product of its digits is 840, while the sum is 26.

The square root of 521672111 is about 22840.1425345815. The cubic root of 521672111 is about 805.0061653528.

The spelling of 521672111 in words is "five hundred twenty-one million, six hundred seventy-two thousand, one hundred eleven".