551561641 has 4 divisors (see below), whose sum is σ = 569353984. Its totient is φ = 533769300.

The previous prime is 551561629. The next prime is 551561657. The reversal of 551561641 is 146165155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 551561641 - 2⁵ = 551561609 is a prime.

It is a super-2 number, since 2×551561641² = 608440487645225762, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 551561597 and 551561606.

It is not an unprimeable number, because it can be changed into a prime (551561611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8896125 + ... + 8896186.

It is an arithmetic number, because the mean of its divisors is an integer number (142338496).

Almost surely, 2^551561641 is an apocalyptic number.

It is an amenable number.

551561641 is a deficient number, since it is larger than the sum of its proper divisors (17792343).

551561641 is a wasteful number, since it uses less digits than its factorization.

551561641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17792342.

The product of its digits is 18000, while the sum is 34.

The square root of 551561641 is about 23485.3494970801. The cubic root of 551561641 is about 820.0959837078.

The spelling of 551561641 in words is "five hundred fifty-one million, five hundred sixty-one thousand, six hundred forty-one".