551557881 has 24 divisors (see below), whose sum is σ = 911237184. Its totient is φ = 314923680.

The previous prime is 551557879. The next prime is 551557883. The reversal of 551557881 is 188755155.

551557881 is a `hidden beast` number, since 5 + 515 + 57 + 8 + 81 = 666.

It is an interprime number because it is at equal distance from previous prime (551557879) and next prime (551557883).

It is not a de Polignac number, because 551557881 - 2¹ = 551557879 is a prime.

It is a super-2 number, since 2×551557881² = 608432192186420322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (551557883) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 99811 + ... + 105191.

It is an arithmetic number, because the mean of its divisors is an integer number (37968216).

Almost surely, 2^551557881 is an apocalyptic number.

It is an amenable number.

551557881 is a deficient number, since it is larger than the sum of its proper divisors (359679303).

551557881 is a wasteful number, since it uses less digits than its factorization.

551557881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7021 (or 7018 counting only the distinct ones).

The product of its digits is 280000, while the sum is 45.

The square root of 551557881 is about 23485.2694470385. The cubic root of 551557881 is about 820.0941201700.

It can be divided in two parts, 55155 and 7881, that added together give a palindrome (63036).

The spelling of 551557881 in words is "five hundred fifty-one million, five hundred fifty-seven thousand, eight hundred eighty-one".