133813131 has 8 divisors (see below), whose sum is σ = 179996880. Its totient is φ = 88419072.

The previous prime is 133813117. The next prime is 133813139. The reversal of 133813131 is 131318331.

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

It is not a de Polignac number, because 133813131 - 2¹³ = 133804939 is a prime.

It is a super-2 number, since 2×133813131² = 35811908056046322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133813139) 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, 197026 + ... + 197703.

It is an arithmetic number, because the mean of its divisors is an integer number (22499610).

Almost surely, 2^133813131 is an apocalyptic number.

133813131 is a deficient number, since it is larger than the sum of its proper divisors (46183749).

133813131 is a wasteful number, since it uses less digits than its factorization.

133813131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394845.

The product of its digits is 648, while the sum is 24.

The square root of 133813131 is about 11567.7625753643. The cubic root of 133813131 is about 511.4850104873.

The spelling of 133813131 in words is "one hundred thirty-three million, eight hundred thirteen thousand, one hundred thirty-one".