133172385 has 32 divisors (see below), whose sum is σ = 219732480. Its totient is φ = 68836608.

The previous prime is 133172383. The next prime is 133172399. The reversal of 133172385 is 583271331.

It is not a de Polignac number, because 133172385 - 2¹ = 133172383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133172383) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75979 + ... + 77711.

It is an arithmetic number, because the mean of its divisors is an integer number (6866640).

Almost surely, 2^133172385 is an apocalyptic number.

133172385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

133172385 is a deficient number, since it is larger than the sum of its proper divisors (86560095).

133172385 is a wasteful number, since it uses less digits than its factorization.

133172385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1897.

The product of its digits is 15120, while the sum is 33.

The square root of 133172385 is about 11540.0340120816. The cubic root of 133172385 is about 510.6673117854.

The spelling of 133172385 in words is "one hundred thirty-three million, one hundred seventy-two thousand, three hundred eighty-five".