551099978 has 64 divisors (see below), whose sum is σ = 1050295680. Its totient is φ = 213062400.

The previous prime is 551099947. The next prime is 551099993. The reversal of 551099978 is 879990155.

It is a super-2 number, since 2×551099978² = 607422371503200968, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 199688 + ... + 202428.

It is an arithmetic number, because the mean of its divisors is an integer number (16410870).

Almost surely, 2^551099978 is an apocalyptic number.

551099978 is a deficient number, since it is larger than the sum of its proper divisors (499195702).

551099978 is a wasteful number, since it uses less digits than its factorization.

551099978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2823.

The product of its (nonzero) digits is 1020600, while the sum is 53.

The square root of 551099978 is about 23475.5186950150. The cubic root of 551099978 is about 819.8671101326.

The spelling of 551099978 in words is "five hundred fifty-one million, ninety-nine thousand, nine hundred seventy-eight".