133123881 has 16 divisors (see below), whose sum is σ = 197756928. Its totient is φ = 78963600.

The previous prime is 133123877. The next prime is 133123933. The reversal of 133123881 is 188321331.

It is not a de Polignac number, because 133123881 - 2² = 133123877 is a prime.

It is a super-2 number, since 2×133123881² = 35443935385004322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133123801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41365 + ... + 44466.

It is an arithmetic number, because the mean of its divisors is an integer number (12359808).

Almost surely, 2^133123881 is an apocalyptic number.

133123881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133123881 is a deficient number, since it is larger than the sum of its proper divisors (64633047).

133123881 is a wasteful number, since it uses less digits than its factorization.

133123881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85892.

The product of its digits is 3456, while the sum is 30.

The square root of 133123881 is about 11537.9322670919. The cubic root of 133123881 is about 510.6053058997.

The spelling of 133123881 in words is "one hundred thirty-three million, one hundred twenty-three thousand, eight hundred eighty-one".