133351816 has 48 divisors (see below), whose sum is σ = 276004260. Its totient is φ = 60353280.

The previous prime is 133351787. The next prime is 133351819. The reversal of 133351816 is 618153331.

It can be written as a sum of positive squares in 6 ways, for example, as 2340900 + 131010916 = 1530^2 + 11446^2 .

It is not an unprimeable number, because it can be changed into a prime (133351819) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70726 + ... + 72586.

Almost surely, 2^133351816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133351816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138002130).

133351816 is an abundant number, since it is smaller than the sum of its proper divisors (142652444).

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

133351816 is a wasteful number, since it uses less digits than its factorization.

133351816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946 (or 1929 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

The square root of 133351816 is about 11547.8056790024. The cubic root of 133351816 is about 510.8965595747.

It can be divided in two parts, 13335 and 1816, that added together give a palindrome (15151).

The spelling of 133351816 in words is "one hundred thirty-three million, three hundred fifty-one thousand, eight hundred sixteen".