133121536 has 20 divisors (see below), whose sum is σ = 265984092. Its totient is φ = 66560512.

The previous prime is 133121503. The next prime is 133121537. The reversal of 133121536 is 635121331.

It is a self number, because there is not a number n which added to its sum of digits gives 133121536.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133121537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129490 + ... + 130513.

Almost surely, 2^133121536 is an apocalyptic number.

133121536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

133121536 is a deficient number, since it is larger than the sum of its proper divisors (132862556).

133121536 is an frugal number, since it uses more digits than its factorization.

133121536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260021 (or 260005 counting only the distinct ones).

The product of its digits is 1620, while the sum is 25.

The square root of 133121536 is about 11537.8306453163. The cubic root of 133121536 is about 510.6023077487.

Adding to 133121536 its reverse (635121331), we get a palindrome (768242867).

The spelling of 133121536 in words is "one hundred thirty-three million, one hundred twenty-one thousand, five hundred thirty-six".