133121501 has 4 divisors (see below), whose sum is σ = 133247100. Its totient is φ = 132995904.

The previous prime is 133121497. The next prime is 133121503. The reversal of 133121501 is 105121331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 104755225 + 28366276 = 10235^2 + 5326^2 .

It is a cyclic number.

It is not a de Polignac number, because 133121501 - 2² = 133121497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133121501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133121503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61196 + ... + 63333.

It is an arithmetic number, because the mean of its divisors is an integer number (33311775).

Almost surely, 2^133121501 is an apocalyptic number.

It is an amenable number.

133121501 is a deficient number, since it is larger than the sum of its proper divisors (125599).

133121501 is a wasteful number, since it uses less digits than its factorization.

133121501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125598.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 133121501 is about 11537.8291285666. The cubic root of 133121501 is about 510.6022629999.

Adding to 133121501 its reverse (105121331), we get a palindrome (238242832).

The spelling of 133121501 in words is "one hundred thirty-three million, one hundred twenty-one thousand, five hundred one".