154352221 has 2 divisors, whose sum is σ = 154352222. Its totient is φ = 154352220.

The previous prime is 154352213. The next prime is 154352227. The reversal of 154352221 is 122253451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153487321 + 864900 = 12389^2 + 930^2 .

It is an emirp because it is prime and its reverse (122253451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 154352221 - 2³ = 154352213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154352227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77176110 + 77176111.

It is an arithmetic number, because the mean of its divisors is an integer number (77176111).

Almost surely, 2^154352221 is an apocalyptic number.

It is an amenable number.

154352221 is a deficient number, since it is larger than the sum of its proper divisors (1).

154352221 is an equidigital number, since it uses as much as digits as its factorization.

154352221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 25.

The square root of 154352221 is about 12423.8569293114. The cubic root of 154352221 is about 536.4191755630.

The spelling of 154352221 in words is "one hundred fifty-four million, three hundred fifty-two thousand, two hundred twenty-one".