133444121531 has 16 divisors (see below), whose sum is σ = 155688230400. Its totient is φ = 114330502440.

The previous prime is 133444121507. The next prime is 133444121543. The reversal of 133444121531 is 135121444331.

It is not a de Polignac number, because 133444121531 - 2⁶ = 133444121467 is a prime.

It is a super-2 number, since 2×133444121531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133444121581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 708500 + ... + 876846.

It is an arithmetic number, because the mean of its divisors is an integer number (9730514400).

Almost surely, 2^133444121531 is an apocalyptic number.

133444121531 is a deficient number, since it is larger than the sum of its proper divisors (22244108869).

133444121531 is an equidigital number, since it uses as much as digits as its factorization.

133444121531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170679 (or 170665 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

Adding to 133444121531 its reverse (135121444331), we get a palindrome (268565565862).

The spelling of 133444121531 in words is "one hundred thirty-three billion, four hundred forty-four million, one hundred twenty-one thousand, five hundred thirty-one".