1261326132530 has 32 divisors (see below), whose sum is σ = 2349713499840. Its totient is φ = 486917717440.

The previous prime is 1261326132487. The next prime is 1261326132571. The reversal of 1261326132530 is 352316231621.

It is a happy number.

It is a super-2 number, since 2×1261326132530² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 301856 + ... + 1616715.

It is an arithmetic number, because the mean of its divisors is an integer number (73428546870).

Almost surely, 2^{1261326132530} is an apocalyptic number.

1261326132530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261326132530 is a deficient number, since it is larger than the sum of its proper divisors (1088387367310).

1261326132530 is a wasteful number, since it uses less digits than its factorization.

1261326132530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920874.

The product of its (nonzero) digits is 38880, while the sum is 35.

Subtracting from 1261326132530 its reverse (352316231621), we obtain a palindrome (909009900909).

The spelling of 1261326132530 in words is "one trillion, two hundred sixty-one billion, three hundred twenty-six million, one hundred thirty-two thousand, five hundred thirty".