1051999609 has 2 divisors, whose sum is σ = 1051999610. Its totient is φ = 1051999608.

The previous prime is 1051999567. The next prime is 1051999639. The reversal of 1051999609 is 9069991501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 970945600 + 81054009 = 31160^2 + 9003^2 .

It is a cyclic number.

It is not a de Polignac number, because 1051999609 - 2²⁷ = 917781881 is a prime.

It is a super-2 number, since 2×1051999609² = 2213406354672305762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1051999639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525999804 + 525999805.

It is an arithmetic number, because the mean of its divisors is an integer number (525999805).

Almost surely, 2^1051999609 is an apocalyptic number.

It is an amenable number.

1051999609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1051999609 is an equidigital number, since it uses as much as digits as its factorization.

1051999609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 196830, while the sum is 49.

The square root of 1051999609 is about 32434.5434529299. The cubic root of 1051999609 is about 1017.0411525318.

The spelling of 1051999609 in words is "one billion, fifty-one million, nine hundred ninety-nine thousand, six hundred nine".