1550242261 has 2 divisors, whose sum is σ = 1550242262. Its totient is φ = 1550242260.

The previous prime is 1550242237. The next prime is 1550242303. The reversal of 1550242261 is 1622420551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1496219761 + 54022500 = 38681^2 + 7350^2 .

It is a cyclic number.

It is not a de Polignac number, because 1550242261 - 2⁵ = 1550242229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1550242231) 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, 775121130 + 775121131.

It is an arithmetic number, because the mean of its divisors is an integer number (775121131).

Almost surely, 2^1550242261 is an apocalyptic number.

It is an amenable number.

1550242261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1550242261 is an equidigital number, since it uses as much as digits as its factorization.

1550242261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 1550242261 is about 39373.1159676244. The cubic root of 1550242261 is about 1157.3548181713.

The spelling of 1550242261 in words is "one billion, five hundred fifty million, two hundred forty-two thousand, two hundred sixty-one".