133121545 has 16 divisors (see below), whose sum is σ = 162062208. Its totient is φ = 104965120.

The previous prime is 133121537. The next prime is 133121561. The reversal of 133121545 is 545121331.

It is a happy number.

It is not a de Polignac number, because 133121545 - 2³ = 133121537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108777 + ... + 109993.

It is an arithmetic number, because the mean of its divisors is an integer number (10128888).

Almost surely, 2^133121545 is an apocalyptic number.

It is an amenable number.

133121545 is a deficient number, since it is larger than the sum of its proper divisors (28940663).

133121545 is a wasteful number, since it uses less digits than its factorization.

133121545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520.

The product of its digits is 1800, while the sum is 25.

The square root of 133121545 is about 11537.8310353376. The cubic root of 133121545 is about 510.6023192555.

Adding to 133121545 its reverse (545121331), we get a palindrome (678242876).

The spelling of 133121545 in words is "one hundred thirty-three million, one hundred twenty-one thousand, five hundred forty-five".