551689858 has 4 divisors (see below), whose sum is σ = 827534790. Its totient is φ = 275844928.

The previous prime is 551689819. The next prime is 551689861. The reversal of 551689858 is 858986155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 858986155 = 5 ⋅171797231.

It can be written as a sum of positive squares in only one way, i.e., 336979449 + 214710409 = 18357^2 + 14653^2 .

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 551689799 and 551689808.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137922463 + ... + 137922466.

Almost surely, 2^551689858 is an apocalyptic number.

551689858 is a deficient number, since it is larger than the sum of its proper divisors (275844932).

551689858 is a wasteful number, since it uses less digits than its factorization.

551689858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275844931.

The product of its digits is 3456000, while the sum is 55.

The square root of 551689858 is about 23488.0790615154. The cubic root of 551689858 is about 820.1595257747.

The spelling of 551689858 in words is "five hundred fifty-one million, six hundred eighty-nine thousand, eight hundred fifty-eight".