1050191981 has 2 divisors, whose sum is σ = 1050191982. Its totient is φ = 1050191980.

The previous prime is 1050191957. The next prime is 1050192019. The reversal of 1050191981 is 1891910501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1032593956 + 17598025 = 32134^2 + 4195^2 .

It is a cyclic number.

It is not a de Polignac number, because 1050191981 - 2¹⁴ = 1050175597 is a prime.

It is a super-2 number, since 2×1050191981² = 2205806393913408722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1050191911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525095990 + 525095991.

It is an arithmetic number, because the mean of its divisors is an integer number (525095991).

Almost surely, 2^1050191981 is an apocalyptic number.

It is an amenable number.

1050191981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1050191981 is an equidigital number, since it uses as much as digits as its factorization.

1050191981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 35.

The square root of 1050191981 is about 32406.6656877871. The cubic root of 1050191981 is about 1016.4582986872.

The spelling of 1050191981 in words is "one billion, fifty million, one hundred ninety-one thousand, nine hundred eighty-one".