1540133223531 has 32 divisors (see below), whose sum is σ = 2353957632000. Its totient is φ = 877419565056.

The previous prime is 1540133223511. The next prime is 1540133223557. The reversal of 1540133223531 is 1353223310451.

It is not a de Polignac number, because 1540133223531 - 2²² = 1540129029227 is a prime.

It is a super-2 number, since 2×1540133223531² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1540133223492 and 1540133223501.

It is not an unprimeable number, because it can be changed into a prime (1540133223511) 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, 27848595 + ... + 27903843.

It is an arithmetic number, because the mean of its divisors is an integer number (73561176000).

Almost surely, 2^{1540133223531} is an apocalyptic number.

1540133223531 is a deficient number, since it is larger than the sum of its proper divisors (813824408469).

1540133223531 is a wasteful number, since it uses less digits than its factorization.

1540133223531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59243.

The product of its (nonzero) digits is 32400, while the sum is 33.

Adding to 1540133223531 its reverse (1353223310451), we get a palindrome (2893356533982).

The spelling of 1540133223531 in words is "one trillion, five hundred forty billion, one hundred thirty-three million, two hundred twenty-three thousand, five hundred thirty-one".