133731081 has 20 divisors (see below), whose sum is σ = 217933584. Its totient is φ = 81048600.

The previous prime is 133731077. The next prime is 133731083. The reversal of 133731081 is 180137331.

It is not a de Polignac number, because 133731081 - 2² = 133731077 is a prime.

It is a super-2 number, since 2×133731081² = 35768004050857122, which contains 22 as substring.

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 (133731083) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 74155 + ... + 75936.

Almost surely, 2^133731081 is an apocalyptic number.

133731081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133731081 is a deficient number, since it is larger than the sum of its proper divisors (84202503).

133731081 is a wasteful number, since it uses less digits than its factorization.

133731081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150114 (or 150105 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 133731081 is about 11564.2155375970. The cubic root of 133731081 is about 511.3804469431.

The spelling of 133731081 in words is "one hundred thirty-three million, seven hundred thirty-one thousand, eighty-one".