551690845 has 4 divisors (see below), whose sum is σ = 662029020. Its totient is φ = 441352672.

The previous prime is 551690801. The next prime is 551690863. The reversal of 551690845 is 548096155.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 118135161 + 433555684 = 10869^2 + 20822^2 .

It is a cyclic number.

It is not a de Polignac number, because 551690845 - 2⁷ = 551690717 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55169080 + ... + 55169089.

It is an arithmetic number, because the mean of its divisors is an integer number (165507255).

Almost surely, 2^551690845 is an apocalyptic number.

It is an amenable number.

551690845 is a deficient number, since it is larger than the sum of its proper divisors (110338175).

551690845 is a wasteful number, since it uses less digits than its factorization.

551690845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110338174.

The product of its (nonzero) digits is 216000, while the sum is 43.

The square root of 551690845 is about 23488.1000721642. The cubic root of 551690845 is about 820.1600148762.

The spelling of 551690845 in words is "five hundred fifty-one million, six hundred ninety thousand, eight hundred forty-five".