1045991213 has 2 divisors, whose sum is σ = 1045991214. Its totient is φ = 1045991212.

The previous prime is 1045991209. The next prime is 1045991237. The reversal of 1045991213 is 3121995401.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1034136964 + 11854249 = 32158^2 + 3443^2 .

It is a cyclic number.

It is not a de Polignac number, because 1045991213 - 2² = 1045991209 is a prime.

It is a super-2 number, since 2×1045991213² = 2188195235346422738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1045991273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 522995606 + 522995607.

It is an arithmetic number, because the mean of its divisors is an integer number (522995607).

Almost surely, 2^1045991213 is an apocalyptic number.

It is an amenable number.

1045991213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1045991213 is an equidigital number, since it uses as much as digits as its factorization.

1045991213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 1045991213 is about 32341.7874119536. The cubic root of 1045991213 is about 1015.1012098676.

The spelling of 1045991213 in words is "one billion, forty-five million, nine hundred ninety-one thousand, two hundred thirteen".