133521545 has 8 divisors (see below), whose sum is σ = 160383240. Its totient is φ = 106712320.

The previous prime is 133521541. The next prime is 133521559. The reversal of 133521545 is 545125331.

It can be written as a sum of positive squares in 4 ways, for example, as 9265936 + 124255609 = 3044^2 + 11147^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 133521545 - 2² = 133521541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133521541) 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, 7280 + ... + 17889.

It is an arithmetic number, because the mean of its divisors is an integer number (20047905).

Almost surely, 2^133521545 is an apocalyptic number.

It is an amenable number.

133521545 is a deficient number, since it is larger than the sum of its proper divisors (26861695).

133521545 is a wasteful number, since it uses less digits than its factorization.

133521545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26235.

The product of its digits is 9000, while the sum is 29.

The square root of 133521545 is about 11555.1523140113. The cubic root of 133521545 is about 511.1132225373.

Adding to 133521545 its reverse (545125331), we get a palindrome (678646876).

The spelling of 133521545 in words is "one hundred thirty-three million, five hundred twenty-one thousand, five hundred forty-five".