521553998 has 16 divisors (see below), whose sum is σ = 918258144. Its totient is φ = 217481760.

The previous prime is 521553997. The next prime is 521554043. The reversal of 521553998 is 899355125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521553997) 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, 502913 + ... + 503948.

It is an arithmetic number, because the mean of its divisors is an integer number (57391134).

Almost surely, 2^521553998 is an apocalyptic number.

521553998 is a deficient number, since it is larger than the sum of its proper divisors (396704146).

521553998 is a wasteful number, since it uses less digits than its factorization.

521553998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006907.

The product of its digits is 486000, while the sum is 47.

The square root of 521553998 is about 22837.5567432245. The cubic root of 521553998 is about 804.9454063255.

The spelling of 521553998 in words is "five hundred twenty-one million, five hundred fifty-three thousand, nine hundred ninety-eight".