1261133436269 has 16 divisors (see below), whose sum is σ = 1444119022080. Its totient is φ = 1078854215040.

The previous prime is 1261133436239. The next prime is 1261133436293. The reversal of 1261133436269 is 9626343311621.

It is not a de Polignac number, because 1261133436269 - 2²⁴ = 1261116659053 is a prime.

It is a super-2 number, since 2×1261133436269² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261133436229) 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 in 15 ways as a sum of consecutive naturals, for example, 60858092 + ... + 60878810.

It is an arithmetic number, because the mean of its divisors is an integer number (90257438880).

Almost surely, 2^{1261133436269} is an apocalyptic number.

It is an amenable number.

1261133436269 is a deficient number, since it is larger than the sum of its proper divisors (182985585811).

1261133436269 is a wasteful number, since it uses less digits than its factorization.

1261133436269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37340.

The product of its digits is 839808, while the sum is 47.

The spelling of 1261133436269 in words is "one trillion, two hundred sixty-one billion, one hundred thirty-three million, four hundred thirty-six thousand, two hundred sixty-nine".