133901691 has 32 divisors (see below), whose sum is σ = 226810368. Its totient is φ = 68240640.

The previous prime is 133901641. The next prime is 133901701. The reversal of 133901691 is 196109331.

It is a happy number.

It is not a de Polignac number, because 133901691 - 2¹⁴ = 133885307 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (133901611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6775 + ... + 17711.

It is an arithmetic number, because the mean of its divisors is an integer number (7087824).

Almost surely, 2^133901691 is an apocalyptic number.

133901691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

133901691 is a deficient number, since it is larger than the sum of its proper divisors (92908677).

133901691 is a wasteful number, since it uses less digits than its factorization.

133901691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11011.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 133901691 is about 11571.5898216278. The cubic root of 133901691 is about 511.5978223443.

The spelling of 133901691 in words is "one hundred thirty-three million, nine hundred one thousand, six hundred ninety-one".