521951998 has 16 divisors (see below), whose sum is σ = 787436640. Its totient is φ = 259477600.

The previous prime is 521951977. The next prime is 521951999. The reversal of 521951998 is 899159125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521951999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505743 + ... + 506773.

It is an arithmetic number, because the mean of its divisors is an integer number (49214790).

Almost surely, 2^521951998 is an apocalyptic number.

521951998 is a deficient number, since it is larger than the sum of its proper divisors (265484642).

521951998 is a wasteful number, since it uses less digits than its factorization.

521951998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2243.

The product of its digits is 291600, while the sum is 49.

The square root of 521951998 is about 22846.2687982086. The cubic root of 521951998 is about 805.1501066481.

The spelling of 521951998 in words is "five hundred twenty-one million, nine hundred fifty-one thousand, nine hundred ninety-eight".