133688025 has 36 divisors (see below), whose sum is σ = 241253532. Its totient is φ = 70763520.

The previous prime is 133688021. The next prime is 133688063. The reversal of 133688025 is 520886331.

It can be written as a sum of positive squares in 6 ways, for example, as 23941449 + 109746576 = 4893^2 + 10476^2 .

It is not a de Polignac number, because 133688025 - 2² = 133688021 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (133688021) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 28657 + ... + 32993.

It is an arithmetic number, because the mean of its divisors is an integer number (6701487).

Almost surely, 2^133688025 is an apocalyptic number.

133688025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

133688025 is a deficient number, since it is larger than the sum of its proper divisors (107565507).

133688025 is a wasteful number, since it uses less digits than its factorization.

133688025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4490 (or 4482 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 133688025 is about 11562.3537828593. The cubic root of 133688025 is about 511.3255597776.

The spelling of 133688025 in words is "one hundred thirty-three million, six hundred eighty-eight thousand, twenty-five".