1269621109 has 2 divisors, whose sum is σ = 1269621110. Its totient is φ = 1269621108.

The previous prime is 1269621083. The next prime is 1269621161. The reversal of 1269621109 is 9011269621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1150702084 + 118919025 = 33922^2 + 10905^2 .

It is a cyclic number.

It is not a de Polignac number, because 1269621109 - 2⁷ = 1269620981 is a prime.

It is a super-2 number, since 2×1269621109² = 3223875520836779762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1269625109) 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, 634810554 + 634810555.

It is an arithmetic number, because the mean of its divisors is an integer number (634810555).

Almost surely, 2^1269621109 is an apocalyptic number.

It is an amenable number.

1269621109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1269621109 is an equidigital number, since it uses as much as digits as its factorization.

1269621109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 1269621109 is about 35631.7429969402. The cubic root of 1269621109 is about 1082.8244283570.

The spelling of 1269621109 in words is "one billion, two hundred sixty-nine million, six hundred twenty-one thousand, one hundred nine".