521199899 has 8 divisors (see below), whose sum is σ = 570224448. Its totient is φ = 472449160.

The previous prime is 521199883. The next prime is 521199907. The reversal of 521199899 is 998991125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 521199899 - 2⁴ = 521199883 is a prime.

It is a super-2 number, since 2×521199899² = 543298669435220402, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 521199899.

It is not an unprimeable number, because it can be changed into a prime (521199829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64457 + ... + 72090.

It is an arithmetic number, because the mean of its divisors is an integer number (71278056).

Almost surely, 2^521199899 is an apocalyptic number.

521199899 is a deficient number, since it is larger than the sum of its proper divisors (49024549).

521199899 is a wasteful number, since it uses less digits than its factorization.

521199899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136905.

The product of its digits is 524880, while the sum is 53.

The square root of 521199899 is about 22829.8028681809. The cubic root of 521199899 is about 804.7631977117.

The spelling of 521199899 in words is "five hundred twenty-one million, one hundred ninety-nine thousand, eight hundred ninety-nine".