551878461 has 16 divisors (see below), whose sum is σ = 843973120. Its totient is φ = 356050080.

The previous prime is 551878451. The next prime is 551878471. The reversal of 551878461 is 164878155.

551878461 is a `hidden beast` number, since 5 + 5 + 187 + 8 + 461 = 666.

It is an interprime number because it is at equal distance from previous prime (551878451) and next prime (551878471).

It is not a de Polignac number, because 551878461 - 2²² = 547684157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551878451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 328840 + ... + 330513.

It is an arithmetic number, because the mean of its divisors is an integer number (52748320).

Almost surely, 2^551878461 is an apocalyptic number.

It is an amenable number.

551878461 is a deficient number, since it is larger than the sum of its proper divisors (292094659).

551878461 is a wasteful number, since it uses less digits than its factorization.

551878461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659393 (or 659387 counting only the distinct ones).

The product of its digits is 268800, while the sum is 45.

The square root of 551878461 is about 23492.0935848638. The cubic root of 551878461 is about 820.2529761805.

The spelling of 551878461 in words is "five hundred fifty-one million, eight hundred seventy-eight thousand, four hundred sixty-one".