133217811 has 32 divisors (see below), whose sum is σ = 202118400. Its totient is φ = 86693760.

The previous prime is 133217809. The next prime is 133217849. The reversal of 133217811 is 118712331.

133217811 = T₁₇₇₃ + T₁₇₇₄ + ... + T₁₈₅₃.

It is a happy number.

It is not a de Polignac number, because 133217811 - 2¹ = 133217809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (133212811) 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, 383740 + ... + 384086.

It is an arithmetic number, because the mean of its divisors is an integer number (6316200).

Almost surely, 2^133217811 is an apocalyptic number.

133217811 is a deficient number, since it is larger than the sum of its proper divisors (68900589).

133217811 is a wasteful number, since it uses less digits than its factorization.

133217811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656 (or 650 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 133217811 is about 11542.0020360421. The cubic root of 133217811 is about 510.7253692077.

The spelling of 133217811 in words is "one hundred thirty-three million, two hundred seventeen thousand, eight hundred eleven".