133561572 has 12 divisors (see below), whose sum is σ = 311643696. Its totient is φ = 44520520.

The previous prime is 133561553. The next prime is 133561591. The reversal of 133561572 is 275165331.

It is an interprime number because it is at equal distance from previous prime (133561553) and next prime (133561591).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×133561572² = 35677387030222368, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5565054 + ... + 5565077.

It is an arithmetic number, because the mean of its divisors is an integer number (25970308).

Almost surely, 2^133561572 is an apocalyptic number.

133561572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

133561572 is an abundant number, since it is smaller than the sum of its proper divisors (178082124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133561572 is a wasteful number, since it uses less digits than its factorization.

133561572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11130138 (or 11130136 counting only the distinct ones).

The product of its digits is 18900, while the sum is 33.

The square root of 133561572 is about 11556.8841821661. The cubic root of 133561572 is about 511.1642911619.

The spelling of 133561572 in words is "one hundred thirty-three million, five hundred sixty-one thousand, five hundred seventy-two".