133121969 has 2 divisors, whose sum is σ = 133121970. Its totient is φ = 133121968.

The previous prime is 133121929. The next prime is 133121971. The reversal of 133121969 is 969121331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133102369 + 19600 = 11537^2 + 140^2 .

It is a cyclic number.

It is not a de Polignac number, because 133121969 - 2²⁰ = 132073393 is a prime.

It is a super-2 number, since 2×133121969² = 35442917260873922, which contains 22 as substring.

Together with 133121971, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133121929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66560984 + 66560985.

It is an arithmetic number, because the mean of its divisors is an integer number (66560985).

Almost surely, 2^133121969 is an apocalyptic number.

It is an amenable number.

133121969 is a deficient number, since it is larger than the sum of its proper divisors (1).

133121969 is an equidigital number, since it uses as much as digits as its factorization.

133121969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 35.

The square root of 133121969 is about 11537.8494096604. The cubic root of 133121969 is about 510.6028613545.

The spelling of 133121969 in words is "one hundred thirty-three million, one hundred twenty-one thousand, nine hundred sixty-nine".