133531602381 has 48 divisors (see below), whose sum is σ = 204679657728. Its totient is φ = 86955897600.

The previous prime is 133531602371. The next prime is 133531602383. The reversal of 133531602381 is 183206135331.

133531602381 is a `hidden beast` number, since 1 + 33 + 531 + 60 + 2 + 38 + 1 = 666.

It is not a de Polignac number, because 133531602381 - 2⁹ = 133531601869 is a prime.

It is a super-2 number, since 2×133531602381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133531602383) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5939121 + ... + 5961561.

It is an arithmetic number, because the mean of its divisors is an integer number (4264159536).

Almost surely, 2^133531602381 is an apocalyptic number.

It is an amenable number.

133531602381 is a deficient number, since it is larger than the sum of its proper divisors (71148055347).

133531602381 is an equidigital number, since it uses as much as digits as its factorization.

133531602381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23024 (or 23012 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 133531602381 in words is "one hundred thirty-three billion, five hundred thirty-one million, six hundred two thousand, three hundred eighty-one".