521229997 has 4 divisors (see below), whose sum is σ = 521573760. Its totient is φ = 520886236.

The previous prime is 521229967. The next prime is 521230019. The reversal of 521229997 is 799922125.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521229997 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 (521229937) 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, 169597 + ... + 172642.

It is an arithmetic number, because the mean of its divisors is an integer number (130393440).

Almost surely, 2^521229997 is an apocalyptic number.

It is an amenable number.

521229997 is a deficient number, since it is larger than the sum of its proper divisors (343763).

521229997 is a wasteful number, since it uses less digits than its factorization.

521229997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343762.

The product of its digits is 204120, while the sum is 46.

The square root of 521229997 is about 22830.4620408786. The cubic root of 521229997 is about 804.7786884390.

The spelling of 521229997 in words is "five hundred twenty-one million, two hundred twenty-nine thousand, nine hundred ninety-seven".