133533385731 has 32 divisors (see below), whose sum is σ = 209557370880. Its totient is φ = 83748359808.

The previous prime is 133533385691. The next prime is 133533385747. The reversal of 133533385731 is 137583335331.

It is a happy number.

133533385731 is a `hidden beast` number, since 1 + 3 + 3 + 533 + 3 + 85 + 7 + 31 = 666.

It is not a de Polignac number, because 133533385731 - 2¹³ = 133533377539 is a prime.

It is a super-2 number, since 2×133533385731² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133533385751) 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, 986130 + ... + 1113336.

It is an arithmetic number, because the mean of its divisors is an integer number (6548667840).

Almost surely, 2^133533385731 is an apocalyptic number.

133533385731 is a deficient number, since it is larger than the sum of its proper divisors (76023985149).

133533385731 is a wasteful number, since it uses less digits than its factorization.

133533385731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129520 (or 129514 counting only the distinct ones).

The product of its digits is 1020600, while the sum is 45.

The spelling of 133533385731 in words is "one hundred thirty-three billion, five hundred thirty-three million, three hundred eighty-five thousand, seven hundred thirty-one".