133721256 has 32 divisors (see below), whose sum is σ = 343340640. Its totient is φ = 43368768.

The previous prime is 133721243. The next prime is 133721257. The reversal of 133721256 is 652127331.

It is not an unprimeable number, because it can be changed into a prime (133721257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74406 + ... + 76181.

It is an arithmetic number, because the mean of its divisors is an integer number (10729395).

Almost surely, 2^133721256 is an apocalyptic number.

It is an amenable number.

133721256 is an abundant number, since it is smaller than the sum of its proper divisors (209619384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133721256 is a wasteful number, since it uses less digits than its factorization.

133721256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150633 (or 150629 counting only the distinct ones).

The product of its digits is 7560, while the sum is 30.

The square root of 133721256 is about 11563.7907279577. The cubic root of 133721256 is about 511.3679232129.

Adding to 133721256 its reverse (652127331), we get a palindrome (785848587).

The spelling of 133721256 in words is "one hundred thirty-three million, seven hundred twenty-one thousand, two hundred fifty-six".