1261487461169 has 32 divisors (see below), whose sum is σ = 1398239969280. Its totient is φ = 1130974161408.

The previous prime is 1261487461133. The next prime is 1261487461177. The reversal of 1261487461169 is 9611647841621.

It is not a de Polignac number, because 1261487461169 - 2⁸ = 1261487460913 is a prime.

It is a super-2 number, since 2×1261487461169² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261487461369) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28691927 + ... + 28735859.

It is an arithmetic number, because the mean of its divisors is an integer number (43694999040).

Almost surely, 2^{1261487461169} is an apocalyptic number.

It is an amenable number.

1261487461169 is a deficient number, since it is larger than the sum of its proper divisors (136752508111).

1261487461169 is a wasteful number, since it uses less digits than its factorization.

1261487461169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44481.

The product of its digits is 3483648, while the sum is 56.

The spelling of 1261487461169 in words is "one trillion, two hundred sixty-one billion, four hundred eighty-seven million, four hundred sixty-one thousand, one hundred sixty-nine".