551491488 has 144 divisors (see below), whose sum is σ = 1632024576. Its totient is φ = 176463360.

The previous prime is 551491481. The next prime is 551491489. The reversal of 551491488 is 884194155.

It is a happy number.

551491488 is a `hidden beast` number, since 5 + 514 + 91 + 48 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×551491488² = 608285722672908288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (551491481) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1990806 + ... + 1991082.

It is an arithmetic number, because the mean of its divisors is an integer number (11333504).

Almost surely, 2^551491488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551491488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (816012288).

551491488 is an abundant number, since it is smaller than the sum of its proper divisors (1080533088).

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

551491488 is a wasteful number, since it uses less digits than its factorization.

551491488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547 (or 536 counting only the distinct ones).

The product of its digits is 230400, while the sum is 45.

The square root of 551491488 is about 23483.8559014486. The cubic root of 551491488 is about 820.0612129596.

The spelling of 551491488 in words is "five hundred fifty-one million, four hundred ninety-one thousand, four hundred eighty-eight".