551491512 has 256 divisors, whose sum is σ = 1719083520. Its totient is φ = 145152000.

The previous prime is 551491489. The next prime is 551491541. The reversal of 551491512 is 215194155.

It is a super-2 number, since 2×551491512² = 608285775616092288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5460262 + ... + 5460362.

It is an arithmetic number, because the mean of its divisors is an integer number (6715170).

Almost surely, 2^551491512 is an apocalyptic number.

551491512 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551491512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (859541760).

551491512 is an abundant number, since it is smaller than the sum of its proper divisors (1167592008).

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

551491512 is a wasteful number, since it uses less digits than its factorization.

551491512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 210 counting only the distinct ones).

The product of its digits is 9000, while the sum is 33.

The square root of 551491512 is about 23483.8564124379. The cubic root of 551491512 is about 820.0612248555.

The spelling of 551491512 in words is "five hundred fifty-one million, four hundred ninety-one thousand, five hundred twelve".