1261383020131 has 16 divisors (see below), whose sum is σ = 1360211227200. Its totient is φ = 1162812313728.

The previous prime is 1261383020129. The next prime is 1261383020237. The reversal of 1261383020131 is 1310203831621.

It is a happy number.

It is not a de Polignac number, because 1261383020131 - 2¹ = 1261383020129 is a prime.

It is a super-2 number, since 2×1261383020131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1261383020093 and 1261383020102.

It is not an unprimeable number, because it can be changed into a prime (1261383020831) 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, 95343225 + ... + 95356453.

It is an arithmetic number, because the mean of its divisors is an integer number (85013201700).

Almost surely, 2^{1261383020131} is an apocalyptic number.

1261383020131 is a deficient number, since it is larger than the sum of its proper divisors (98828207069).

1261383020131 is a wasteful number, since it uses less digits than its factorization.

1261383020131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22398.

The product of its (nonzero) digits is 5184, while the sum is 31.

Adding to 1261383020131 its reverse (1310203831621), we get a palindrome (2571586851752).

The spelling of 1261383020131 in words is "one trillion, two hundred sixty-one billion, three hundred eighty-three million, twenty thousand, one hundred thirty-one".