133131945 has 8 divisors (see below), whose sum is σ = 213011136. Its totient is φ = 71003696.

The previous prime is 133131937. The next prime is 133131959. The reversal of 133131945 is 549131331.

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

It is a cyclic number.

It is not a de Polignac number, because 133131945 - 2³ = 133131937 is a prime.

It is a super-2 number, since 2×133131945² = 35448229558966050, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4437717 + ... + 4437746.

It is an arithmetic number, because the mean of its divisors is an integer number (26626392).

Almost surely, 2^133131945 is an apocalyptic number.

133131945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

133131945 is a deficient number, since it is larger than the sum of its proper divisors (79879191).

133131945 is an equidigital number, since it uses as much as digits as its factorization.

133131945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8875471.

The product of its digits is 4860, while the sum is 30.

The square root of 133131945 is about 11538.2817178296. The cubic root of 133131945 is about 510.6156156904.

The spelling of 133131945 in words is "one hundred thirty-three million, one hundred thirty-one thousand, nine hundred forty-five".