133991051 has 4 divisors (see below), whose sum is σ = 134022504. Its totient is φ = 133959600.

The previous prime is 133991027. The next prime is 133991057. The reversal of 133991051 is 150199331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 150199331 = 761 ⋅197371.

It is a cyclic number.

It is not a de Polignac number, because 133991051 - 2¹⁰ = 133990027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133990999 and 133991017.

It is not an unprimeable number, because it can be changed into a prime (133991057) 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, 8105 + ... + 18266.

It is an arithmetic number, because the mean of its divisors is an integer number (33505626).

Almost surely, 2^133991051 is an apocalyptic number.

133991051 is a deficient number, since it is larger than the sum of its proper divisors (31453).

133991051 is an equidigital number, since it uses as much as digits as its factorization.

133991051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31452.

The product of its (nonzero) digits is 3645, while the sum is 32.

The square root of 133991051 is about 11575.4503584094. The cubic root of 133991051 is about 511.7116028727.

The spelling of 133991051 in words is "one hundred thirty-three million, nine hundred ninety-one thousand, fifty-one".