133985767 has 4 divisors (see below), whose sum is σ = 136836576. Its totient is φ = 131134960.

The previous prime is 133985723. The next prime is 133985791. The reversal of 133985767 is 767589331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 133985767 - 2⁷ = 133985639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133985767.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133985167) 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, 1425334 + ... + 1425427.

It is an arithmetic number, because the mean of its divisors is an integer number (34209144).

Almost surely, 2^133985767 is an apocalyptic number.

133985767 is a deficient number, since it is larger than the sum of its proper divisors (2850809).

133985767 is an equidigital number, since it uses as much as digits as its factorization.

133985767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2850808.

The product of its digits is 952560, while the sum is 49.

The square root of 133985767 is about 11575.2221144996. Note that the first 3 decimals coincide. The cubic root of 133985767 is about 511.7048762552.

The spelling of 133985767 in words is "one hundred thirty-three million, nine hundred eighty-five thousand, seven hundred sixty-seven".