133731923 has 8 divisors (see below), whose sum is σ = 148665216. Its totient is φ = 119462400.

The previous prime is 133731919. The next prime is 133731929. The reversal of 133731923 is 329137331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133731923 - 2² = 133731919 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 133731923.

It is not an unprimeable number, because it can be changed into a prime (133731929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165518 + ... + 166323.

It is an arithmetic number, because the mean of its divisors is an integer number (18583152).

Almost surely, 2^133731923 is an apocalyptic number.

133731923 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

133731923 is a deficient number, since it is larger than the sum of its proper divisors (14933293).

133731923 is a wasteful number, since it uses less digits than its factorization.

133731923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331885.

The product of its digits is 10206, while the sum is 32.

The square root of 133731923 is about 11564.2519429490. The cubic root of 133731923 is about 511.3815201951.

The spelling of 133731923 in words is "one hundred thirty-three million, seven hundred thirty-one thousand, nine hundred twenty-three".