551856487 has 18 divisors (see below), whose sum is σ = 683941272. Its totient is φ = 435994416.

The previous prime is 551856467. The next prime is 551856493. The reversal of 551856487 is 784658155.

It is not a de Polignac number, because 551856487 - 2⁷ = 551856359 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 551856487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551856407) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 807648 + ... + 808330.

Almost surely, 2^551856487 is an apocalyptic number.

551856487 is a deficient number, since it is larger than the sum of its proper divisors (132084785).

551856487 is an frugal number, since it uses more digits than its factorization.

551856487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399 (or 703 counting only the distinct ones).

The product of its digits is 1344000, while the sum is 49.

The square root of 551856487 is about 23491.6258909425. The cubic root of 551856487 is about 820.2420894368.

The spelling of 551856487 in words is "five hundred fifty-one million, eight hundred fifty-six thousand, four hundred eighty-seven".