551481990 has 16 divisors (see below), whose sum is σ = 1323556848. Its totient is φ = 147061856.

The previous prime is 551481977. The next prime is 551481991. The reversal of 551481990 is 99184155.

551481990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551481991) 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, 9191337 + ... + 9191396.

It is an arithmetic number, because the mean of its divisors is an integer number (82722303).

Almost surely, 2^551481990 is an apocalyptic number.

551481990 is an abundant number, since it is smaller than the sum of its proper divisors (772074858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551481990 is a wasteful number, since it uses less digits than its factorization.

551481990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18382743.

The product of its (nonzero) digits is 64800, while the sum is 42.

The square root of 551481990 is about 23483.6536765470. The cubic root of 551481990 is about 820.0565051286.

The spelling of 551481990 in words is "five hundred fifty-one million, four hundred eighty-one thousand, nine hundred ninety".