133644889 has 8 divisors (see below), whose sum is σ = 153124928. Its totient is φ = 114261840.

The previous prime is 133644887. The next prime is 133644899. The reversal of 133644889 is 988446331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 133644889 - 2¹ = 133644887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133644887) 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, 21267 + ... + 26824.

It is an arithmetic number, because the mean of its divisors is an integer number (19140616).

Almost surely, 2^133644889 is an apocalyptic number.

It is an amenable number.

133644889 is a deficient number, since it is larger than the sum of its proper divisors (19480039).

133644889 is an equidigital number, since it uses as much as digits as its factorization.

133644889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48495.

The product of its digits is 497664, while the sum is 46.

The square root of 133644889 is about 11560.4882682350. The cubic root of 133644889 is about 511.2705588104.

It can be divided in two parts, 1336 and 44889, that added together give a square (46225 = 215²).

The spelling of 133644889 in words is "one hundred thirty-three million, six hundred forty-four thousand, eight hundred eighty-nine".