154228621 has 2 divisors, whose sum is σ = 154228622. Its totient is φ = 154228620.

The previous prime is 154228603. The next prime is 154228637. The reversal of 154228621 is 126822451.

154228621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134328100 + 19900521 = 11590^2 + 4461^2 .

It is a cyclic number.

It is not a de Polignac number, because 154228621 - 2⁷ = 154228493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154228651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77114310 + 77114311.

It is an arithmetic number, because the mean of its divisors is an integer number (77114311).

Almost surely, 2^154228621 is an apocalyptic number.

It is an amenable number.

154228621 is a deficient number, since it is larger than the sum of its proper divisors (1).

154228621 is an equidigital number, since it uses as much as digits as its factorization.

154228621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 31.

The square root of 154228621 is about 12418.8816324176. The cubic root of 154228621 is about 536.2759552606.

The spelling of 154228621 in words is "one hundred fifty-four million, two hundred twenty-eight thousand, six hundred twenty-one".