521367971 has 4 divisors (see below), whose sum is σ = 528510072. Its totient is φ = 514225872.

The previous prime is 521367967. The next prime is 521367989. The reversal of 521367971 is 179763125.

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 521367971 - 2² = 521367967 is a prime.

It is a super-2 number, since 2×521367971² = 543649122369313682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (521367941) 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, 3570941 + ... + 3571086.

It is an arithmetic number, because the mean of its divisors is an integer number (132127518).

Almost surely, 2^521367971 is an apocalyptic number.

521367971 is a deficient number, since it is larger than the sum of its proper divisors (7142101).

521367971 is an equidigital number, since it uses as much as digits as its factorization.

521367971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7142100.

The product of its digits is 79380, while the sum is 41.

The square root of 521367971 is about 22833.4835493842. The cubic root of 521367971 is about 804.8496927552.

The spelling of 521367971 in words is "five hundred twenty-one million, three hundred sixty-seven thousand, nine hundred seventy-one".