550955551 has 4 divisors (see below), whose sum is σ = 554919400. Its totient is φ = 546991704.

The previous prime is 550955513. The next prime is 550955563. The reversal of 550955551 is 155559055.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 550955551 - 2¹¹ = 550953503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550955351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1981716 + ... + 1981993.

It is an arithmetic number, because the mean of its divisors is an integer number (138729850).

Almost surely, 2^550955551 is an apocalyptic number.

550955551 is a deficient number, since it is larger than the sum of its proper divisors (3963849).

550955551 is a wasteful number, since it uses less digits than its factorization.

550955551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3963848.

The product of its (nonzero) digits is 140625, while the sum is 40.

The square root of 550955551 is about 23472.4423739840. The cubic root of 550955551 is about 819.7954829038.

The spelling of 550955551 in words is "five hundred fifty million, nine hundred fifty-five thousand, five hundred fifty-one".