551845540 has 24 divisors (see below), whose sum is σ = 1180743480. Its totient is φ = 216572928.

The previous prime is 551845499. The next prime is 551845549. The reversal of 551845540 is 45548155.

It can be written as a sum of positive squares in 4 ways, for example, as 263932516 + 287913024 = 16246^2 + 16968^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 551845540.

It is not an unprimeable number, because it can be changed into a prime (551845549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259245 + ... + 261364.

It is an arithmetic number, because the mean of its divisors is an integer number (49197645).

Almost surely, 2^551845540 is an apocalyptic number.

It is an amenable number.

551845540 is an abundant number, since it is smaller than the sum of its proper divisors (628897940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551845540 is a wasteful number, since it uses less digits than its factorization.

551845540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520671 (or 520669 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 37.

The square root of 551845540 is about 23491.3928918657. The cubic root of 551845540 is about 820.2366657746.

The spelling of 551845540 in words is "five hundred fifty-one million, eight hundred forty-five thousand, five hundred forty".