133748217 has 6 divisors (see below), whose sum is σ = 193191882. Its totient is φ = 89165472.

The previous prime is 133748213. The next prime is 133748233. The reversal of 133748217 is 712847331.

It can be written as a sum of positive squares in only one way, i.e., 133194681 + 553536 = 11541^2 + 744^2 .

It is not a de Polignac number, because 133748217 - 2² = 133748213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133748213) 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 5 ways as a sum of consecutive naturals, for example, 7430448 + ... + 7430465.

It is an arithmetic number, because the mean of its divisors is an integer number (32198647).

Almost surely, 2^133748217 is an apocalyptic number.

It is an amenable number.

133748217 is a deficient number, since it is larger than the sum of its proper divisors (59443665).

133748217 is a wasteful number, since it uses less digits than its factorization.

133748217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14860919 (or 14860916 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 133748217 is about 11564.9564201514. The cubic root of 133748217 is about 511.4022883904.

The spelling of 133748217 in words is "one hundred thirty-three million, seven hundred forty-eight thousand, two hundred seventeen".