133561442 has 16 divisors (see below), whose sum is σ = 231723072. Its totient is φ = 56550480.

The previous prime is 133561411. The next prime is 133561447. The reversal of 133561442 is 244165331.

It is not an unprimeable number, because it can be changed into a prime (133561447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56309 + ... + 58632.

It is an arithmetic number, because the mean of its divisors is an integer number (14482692).

Almost surely, 2^133561442 is an apocalyptic number.

133561442 is a deficient number, since it is larger than the sum of its proper divisors (98161630).

133561442 is a wasteful number, since it uses less digits than its factorization.

133561442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115033.

The product of its digits is 8640, while the sum is 29.

The square root of 133561442 is about 11556.8785578114. The cubic root of 133561442 is about 511.1641253173.

The spelling of 133561442 in words is "one hundred thirty-three million, five hundred sixty-one thousand, four hundred forty-two".