133873724081 has 4 divisors (see below), whose sum is σ = 134024653632. Its totient is φ = 133722794532.

The previous prime is 133873724069. The next prime is 133873724093. The reversal of 133873724081 is 180427378331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (133873724069) and next prime (133873724093).

It is a cyclic number.

It is not a de Polignac number, because 133873724081 - 2¹⁰ = 133873723057 is a prime.

It is a super-2 number, since 2×133873724081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133873724041) 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, 75463445 + ... + 75465218.

It is an arithmetic number, because the mean of its divisors is an integer number (33506163408).

Almost surely, 2^133873724081 is an apocalyptic number.

It is an amenable number.

133873724081 is a deficient number, since it is larger than the sum of its proper divisors (150929551).

133873724081 is an equidigital number, since it uses as much as digits as its factorization.

133873724081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150929550.

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 133873724081 in words is "one hundred thirty-three billion, eight hundred seventy-three million, seven hundred twenty-four thousand, eighty-one".