1269212005 has 4 divisors (see below), whose sum is σ = 1523054412. Its totient is φ = 1015369600.

The previous prime is 1269211997. The next prime is 1269212029. The reversal of 1269212005 is 5002129621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 578258209 + 690953796 = 24047^2 + 26286^2 .

It is not a de Polignac number, because 1269212005 - 2³ = 1269211997 is a prime.

It is a super-2 number, since 2×1269212005² = 3221798227272240050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126921196 + ... + 126921205.

It is an arithmetic number, because the mean of its divisors is an integer number (380763603).

Almost surely, 2^1269212005 is an apocalyptic number.

It is an amenable number.

1269212005 is a deficient number, since it is larger than the sum of its proper divisors (253842407).

1269212005 is an equidigital number, since it uses as much as digits as its factorization.

1269212005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253842406.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1269212005 is about 35626.0018104754. The cubic root of 1269212005 is about 1082.7081113994.

The spelling of 1269212005 in words is "one billion, two hundred sixty-nine million, two hundred twelve thousand, five".