1841216557 has 2 divisors, whose sum is σ = 1841216558. Its totient is φ = 1841216556.

The previous prime is 1841216551. The next prime is 1841216579. The reversal of 1841216557 is 7556121481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1808885961 + 32330596 = 42531^2 + 5686^2 .

It is a cyclic number.

It is not a de Polignac number, because 1841216557 - 2³ = 1841216549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1841216551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 920608278 + 920608279.

It is an arithmetic number, because the mean of its divisors is an integer number (920608279).

Almost surely, 2^1841216557 is an apocalyptic number.

It is an amenable number.

1841216557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1841216557 is an equidigital number, since it uses as much as digits as its factorization.

1841216557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67200, while the sum is 40.

The square root of 1841216557 is about 42909.3994015297. The cubic root of 1841216557 is about 1225.6551391103.

It can be divided in two parts, 18412 and 16557, that added together give a square (34969 = 187²).

The spelling of 1841216557 in words is "one billion, eight hundred forty-one million, two hundred sixteen thousand, five hundred fifty-seven".