1850536991 has 2 divisors, whose sum is σ = 1850536992. Its totient is φ = 1850536990.

The previous prime is 1850536973. The next prime is 1850536993. The reversal of 1850536991 is 1996350581.

It is a strong prime.

It is an emirp because it is prime and its reverse (1996350581) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1850536991 is a prime.

It is a Sophie Germain prime.

Together with 1850536993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1850536993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 925268495 + 925268496.

It is an arithmetic number, because the mean of its divisors is an integer number (925268496).

Almost surely, 2^1850536991 is an apocalyptic number.

1850536991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1850536991 is an equidigital number, since it uses as much as digits as its factorization.

1850536991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 291600, while the sum is 47.

The square root of 1850536991 is about 43017.8682758688. The cubic root of 1850536991 is about 1227.7197914049.

The spelling of 1850536991 in words is "one billion, eight hundred fifty million, five hundred thirty-six thousand, nine hundred ninety-one".