133445623 has 4 divisors (see below), whose sum is σ = 133495128. Its totient is φ = 133396120.

The previous prime is 133445591. The next prime is 133445647. The reversal of 133445623 is 326544331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 133445623 - 2⁵ = 133445591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133445023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20461 + ... + 26182.

It is an arithmetic number, because the mean of its divisors is an integer number (33373782).

Almost surely, 2^133445623 is an apocalyptic number.

133445623 is a deficient number, since it is larger than the sum of its proper divisors (49505).

133445623 is an equidigital number, since it uses as much as digits as its factorization.

133445623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49504.

The product of its digits is 25920, while the sum is 31.

The square root of 133445623 is about 11551.8666456984. The cubic root of 133445623 is about 511.0163290725.

Adding to 133445623 its reverse (326544331), we get a palindrome (459989954).

The spelling of 133445623 in words is "one hundred thirty-three million, four hundred forty-five thousand, six hundred twenty-three".