551640089 has 72 divisors (see below), whose sum is σ = 806193864. Its totient is φ = 372556800.

The previous prime is 551640079. The next prime is 551640097. The reversal of 551640089 is 980046155.

It can be written as a sum of positive squares in 4 ways, for example, as 94864 + 551545225 = 308^2 + 23485^2 .

It is a de Polignac number, because none of the positive numbers 2^k-551640089 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551640079) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1310099 + ... + 1310519.

It is an arithmetic number, because the mean of its divisors is an integer number (11197137).

Almost surely, 2^551640089 is an apocalyptic number.

It is an amenable number.

551640089 is a deficient number, since it is larger than the sum of its proper divisors (254553775).

551640089 is a wasteful number, since it uses less digits than its factorization.

551640089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 469 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 551640089 is about 23487.0195852943. The cubic root of 551640089 is about 820.1348623118.

The spelling of 551640089 in words is "five hundred fifty-one million, six hundred forty thousand, eighty-nine".