133906961 has 2 divisors, whose sum is σ = 133906962. Its totient is φ = 133906960.

The previous prime is 133906957. The next prime is 133906963. The reversal of 133906961 is 169609331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121969936 + 11937025 = 11044^2 + 3455^2 .

It is a cyclic number.

It is not a de Polignac number, because 133906961 - 2² = 133906957 is a prime.

Together with 133906963, 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 (133906963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66953480 + 66953481.

It is an arithmetic number, because the mean of its divisors is an integer number (66953481).

Almost surely, 2^133906961 is an apocalyptic number.

It is an amenable number.

133906961 is a deficient number, since it is larger than the sum of its proper divisors (1).

133906961 is an equidigital number, since it uses as much as digits as its factorization.

133906961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 133906961 is about 11571.8175322635. The cubic root of 133906961 is about 511.6045339477.

The spelling of 133906961 in words is "one hundred thirty-three million, nine hundred six thousand, nine hundred sixty-one".