1261313355141 has 24 divisors (see below), whose sum is σ = 2102783614464. Its totient is φ = 713614341600.

The previous prime is 1261313355119. The next prime is 1261313355149. The reversal of 1261313355141 is 1415533131621.

1261313355141 is a `hidden beast` number, since 1 + 2 + 6 + 1 + 3 + 133 + 5 + 514 + 1 = 666.

It is not a de Polignac number, because 1261313355141 - 2¹⁰ = 1261313354117 is a prime.

It is a super-2 number, since 2×1261313355141² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1261313355096 and 1261313355105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261313355149) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99106741 + ... + 99119466.

It is an arithmetic number, because the mean of its divisors is an integer number (87615983936).

Almost surely, 2^{1261313355141} is an apocalyptic number.

It is an amenable number.

1261313355141 is a deficient number, since it is larger than the sum of its proper divisors (841470259323).

1261313355141 is a wasteful number, since it uses less digits than its factorization.

1261313355141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198226321 (or 198226318 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

Adding to 1261313355141 its reverse (1415533131621), we get a palindrome (2676846486762).

The spelling of 1261313355141 in words is "one trillion, two hundred sixty-one billion, three hundred thirteen million, three hundred fifty-five thousand, one hundred forty-one".