133391611 has 4 divisors (see below), whose sum is σ = 133416112. Its totient is φ = 133367112.

The previous prime is 133391591. The next prime is 133391617. The reversal of 133391611 is 116193331.

133391611 is a nontrivial binomial coefficient, being equal to C(16334, 2).

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 116193331 = 53 ⋅2192327.

It is a 3-Lehmer number, since φ(133391611) divides (133391611-1)³.

It is a cyclic number.

It is not a de Polignac number, because 133391611 - 2²³ = 125003003 is a prime.

It is a deceptive number, since it divides R_133391610.

It is a self number, because there is not a number n which added to its sum of digits gives 133391611.

It is not an unprimeable number, because it can be changed into a prime (133391617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 16333.

It is an arithmetic number, because the mean of its divisors is an integer number (33354028).

Almost surely, 2^133391611 is an apocalyptic number.

133391611 is the 16333-rd triangular number and also the 8167-th hexagonal number.

133391611 is the 5445-th centered nonagonal number.

133391611 is a deficient number, since it is larger than the sum of its proper divisors (24501).

133391611 is an equidigital number, since it uses as much as digits as its factorization.

133391611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24500.

The product of its digits is 1458, while the sum is 28.

The square root of 133391611 is about 11549.5286050990. The cubic root of 133391611 is about 510.9473752969.

The spelling of 133391611 in words is "one hundred thirty-three million, three hundred ninety-one thousand, six hundred eleven".