133790621 has 2 divisors, whose sum is σ = 133790622. Its totient is φ = 133790620.

The previous prime is 133790617. The next prime is 133790641. The reversal of 133790621 is 126097331.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128006596 + 5784025 = 11314^2 + 2405^2 .

It is an emirp because it is prime and its reverse (126097331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133790621 - 2² = 133790617 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133790611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66895310 + 66895311.

It is an arithmetic number, because the mean of its divisors is an integer number (66895311).

Almost surely, 2^133790621 is an apocalyptic number.

It is an amenable number.

133790621 is a deficient number, since it is larger than the sum of its proper divisors (1).

133790621 is an equidigital number, since it uses as much as digits as its factorization.

133790621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 133790621 is about 11566.7895718734. The cubic root of 133790621 is about 511.4563282667.

The spelling of 133790621 in words is "one hundred thirty-three million, seven hundred ninety thousand, six hundred twenty-one".