551851961 has 2 divisors, whose sum is σ = 551851962. Its totient is φ = 551851960.

The previous prime is 551851921. The next prime is 551851967. The reversal of 551851961 is 169158155.

551851961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 474411961 + 77440000 = 21781^2 + 8800^2 .

It is a cyclic number.

It is not a de Polignac number, because 551851961 - 2²² = 547657657 is a prime.

It is not a weakly prime, because it can be changed into another prime (551851967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275925980 + 275925981.

It is an arithmetic number, because the mean of its divisors is an integer number (275925981).

Almost surely, 2^551851961 is an apocalyptic number.

It is an amenable number.

551851961 is a deficient number, since it is larger than the sum of its proper divisors (1).

551851961 is an equidigital number, since it uses as much as digits as its factorization.

551851961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54000, while the sum is 41.

The square root of 551851961 is about 23491.5295585451. The cubic root of 551851961 is about 820.2398470507.

The spelling of 551851961 in words is "five hundred fifty-one million, eight hundred fifty-one thousand, nine hundred sixty-one".