133773121 has 2 divisors, whose sum is σ = 133773122. Its totient is φ = 133773120.

The previous prime is 133773103. The next prime is 133773127. The reversal of 133773121 is 121377331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108972721 + 24800400 = 10439^2 + 4980^2 .

It is a cyclic number.

It is not a de Polignac number, because 133773121 - 2⁷ = 133772993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133773121.

It is not a weakly prime, because it can be changed into another prime (133773127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66886560 + 66886561.

It is an arithmetic number, because the mean of its divisors is an integer number (66886561).

Almost surely, 2^133773121 is an apocalyptic number.

It is an amenable number.

133773121 is a deficient number, since it is larger than the sum of its proper divisors (1).

133773121 is an equidigital number, since it uses as much as digits as its factorization.

133773121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2646, while the sum is 28.

The square root of 133773121 is about 11566.0330710231. The cubic root of 133773121 is about 511.4340275604.

The spelling of 133773121 in words is "one hundred thirty-three million, seven hundred seventy-three thousand, one hundred twenty-one".