133647157 has 18 divisors (see below), whose sum is σ = 158273154. Its totient is φ = 112523040.

The previous prime is 133647133. The next prime is 133647193. The reversal of 133647157 is 751746331.

It can be written as a sum of positive squares in 3 ways, for example, as 1535121 + 132112036 = 1239^2 + 11494^2 .

It is not a de Polignac number, because 133647157 - 2⁷ = 133647029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133647757) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 181963 + ... + 182695.

It is an arithmetic number, because the mean of its divisors is an integer number (8792953).

Almost surely, 2^133647157 is an apocalyptic number.

It is an amenable number.

133647157 is a deficient number, since it is larger than the sum of its proper divisors (24625997).

133647157 is an frugal number, since it uses more digits than its factorization.

133647157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869 (or 801 counting only the distinct ones).

The product of its digits is 52920, while the sum is 37.

The square root of 133647157 is about 11560.5863605615. The cubic root of 133647157 is about 511.2734509402.

The spelling of 133647157 in words is "one hundred thirty-three million, six hundred forty-seven thousand, one hundred fifty-seven".