551771638 has 16 divisors (see below), whose sum is σ = 903260160. Its totient is φ = 250705000.

The previous prime is 551771621. The next prime is 551771651. The reversal of 551771638 is 836177155.

It is a junction number, because it is equal to n+sod(n) for n = 551771594 and 551771603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101883 + ... + 107161.

It is an arithmetic number, because the mean of its divisors is an integer number (56453760).

Almost surely, 2^551771638 is an apocalyptic number.

551771638 is a deficient number, since it is larger than the sum of its proper divisors (351488522).

551771638 is a wasteful number, since it uses less digits than its factorization.

551771638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10043.

The product of its digits is 176400, while the sum is 43.

The square root of 551771638 is about 23489.8198801098. The cubic root of 551771638 is about 820.2000493473.

The spelling of 551771638 in words is "five hundred fifty-one million, seven hundred seventy-one thousand, six hundred thirty-eight".