133053691 has 4 divisors (see below), whose sum is σ = 135564192. Its totient is φ = 130543192.

The previous prime is 133053647. The next prime is 133053703. The reversal of 133053691 is 196350331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196350331 = 839 ⋅234029.

It is a cyclic number.

It is not a de Polignac number, because 133053691 - 2¹³ = 133045499 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133053601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1255171 + ... + 1255276.

It is an arithmetic number, because the mean of its divisors is an integer number (33891048).

Almost surely, 2^133053691 is an apocalyptic number.

133053691 is a deficient number, since it is larger than the sum of its proper divisors (2510501).

133053691 is an equidigital number, since it uses as much as digits as its factorization.

133053691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2510500.

The product of its (nonzero) digits is 7290, while the sum is 31.

The square root of 133053691 is about 11534.8901598585. The cubic root of 133053691 is about 510.5155506862.

The spelling of 133053691 in words is "one hundred thirty-three million, fifty-three thousand, six hundred ninety-one".