550155121 has 2 divisors, whose sum is σ = 550155122. Its totient is φ = 550155120.

The previous prime is 550155119. The next prime is 550155149. The reversal of 550155121 is 121551055.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 422713600 + 127441521 = 20560^2 + 11289^2 .

It is a cyclic number.

It is not a de Polignac number, because 550155121 - 2¹ = 550155119 is a prime.

Together with 550155119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (550155721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275077560 + 275077561.

It is an arithmetic number, because the mean of its divisors is an integer number (275077561).

Almost surely, 2^550155121 is an apocalyptic number.

It is an amenable number.

550155121 is a deficient number, since it is larger than the sum of its proper divisors (1).

550155121 is an equidigital number, since it uses as much as digits as its factorization.

550155121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1250, while the sum is 25.

The square root of 550155121 is about 23455.3857567937. The cubic root of 550155121 is about 819.3982899875.

The spelling of 550155121 in words is "five hundred fifty million, one hundred fifty-five thousand, one hundred twenty-one".