133157789 has 4 divisors (see below), whose sum is σ = 133359900. Its totient is φ = 132955680.

The previous prime is 133157777. The next prime is 133157831. The reversal of 133157789 is 987751331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 987751331 = 7 ⋅141107333.

It can be written as a sum of positive squares in 2 ways, for example, as 45454564 + 87703225 = 6742^2 + 9365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133157789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133157729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100064 + ... + 101385.

It is an arithmetic number, because the mean of its divisors is an integer number (33339975).

Almost surely, 2^133157789 is an apocalyptic number.

It is an amenable number.

133157789 is a deficient number, since it is larger than the sum of its proper divisors (202111).

133157789 is an equidigital number, since it uses as much as digits as its factorization.

133157789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202110.

The product of its digits is 158760, while the sum is 44.

The square root of 133157789 is about 11539.4015876041. The cubic root of 133157789 is about 510.6486543327.

The spelling of 133157789 in words is "one hundred thirty-three million, one hundred fifty-seven thousand, seven hundred eighty-nine".