551205550 has 24 divisors (see below), whose sum is σ = 1171706256. Its totient is φ = 188984640.

The previous prime is 551205547. The next prime is 551205607. The reversal of 551205550 is 55502155.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 787087 + ... + 787786.

It is an arithmetic number, because the mean of its divisors is an integer number (48821094).

Almost surely, 2^551205550 is an apocalyptic number.

551205550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

551205550 is an abundant number, since it is smaller than the sum of its proper divisors (620500706).

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

551205550 is a wasteful number, since it uses less digits than its factorization.

551205550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574892 (or 1574887 counting only the distinct ones).

The product of its (nonzero) digits is 6250, while the sum is 28.

The square root of 551205550 is about 23477.7671425543. The cubic root of 551205550 is about 819.9194596684.

The spelling of 551205550 in words is "five hundred fifty-one million, two hundred five thousand, five hundred fifty".