133216451281 has 4 divisors (see below), whose sum is σ = 135204756592. Its totient is φ = 131228145972.

The previous prime is 133216451261. The next prime is 133216451317. The reversal of 133216451281 is 182154612331.

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 a cyclic number.

It is not a de Polignac number, because 133216451281 - 2⁷ = 133216451153 is a prime.

It is a super-2 number, since 2×133216451281² (a number of 23 digits) contains 22 as substring.

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 133216451281.

It is not an unprimeable number, because it can be changed into a prime (133216451231) 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, 994152555 + ... + 994152688.

It is an arithmetic number, because the mean of its divisors is an integer number (33801189148).

Almost surely, 2^133216451281 is an apocalyptic number.

It is an amenable number.

133216451281 is a deficient number, since it is larger than the sum of its proper divisors (1988305311).

133216451281 is an equidigital number, since it uses as much as digits as its factorization.

133216451281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988305310.

The product of its digits is 34560, while the sum is 37.

The spelling of 133216451281 in words is "one hundred thirty-three billion, two hundred sixteen million, four hundred fifty-one thousand, two hundred eighty-one".