1550555197 has 2 divisors, whose sum is σ = 1550555198. Its totient is φ = 1550555196.

The previous prime is 1550555141. The next prime is 1550555203. The reversal of 1550555197 is 7915550551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 975562756 + 574992441 = 31234^2 + 23979^2 .

It is a cyclic number.

It is not a de Polignac number, because 1550555197 - 2¹¹ = 1550553149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1550555137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775277598 + 775277599.

It is an arithmetic number, because the mean of its divisors is an integer number (775277599).

Almost surely, 2^1550555197 is an apocalyptic number.

It is an amenable number.

1550555197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1550555197 is an equidigital number, since it uses as much as digits as its factorization.

1550555197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 196875, while the sum is 43.

The square root of 1550555197 is about 39377.0897477201. The cubic root of 1550555197 is about 1157.4326884993.

The spelling of 1550555197 in words is "one billion, five hundred fifty million, five hundred fifty-five thousand, one hundred ninety-seven".