1655775281 has 2 divisors, whose sum is σ = 1655775282. Its totient is φ = 1655775280.

The previous prime is 1655775257. The next prime is 1655775301. The reversal of 1655775281 is 1825775561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1651609600 + 4165681 = 40640^2 + 2041^2 .

It is a cyclic number.

It is not a de Polignac number, because 1655775281 - 2²² = 1651580977 is a prime.

It is a super-2 number, since 2×1655775281² = 5483183562341257922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1655775211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827887640 + 827887641.

It is an arithmetic number, because the mean of its divisors is an integer number (827887641).

Almost surely, 2^1655775281 is an apocalyptic number.

It is an amenable number.

1655775281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655775281 is an equidigital number, since it uses as much as digits as its factorization.

1655775281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 588000, while the sum is 47.

The square root of 1655775281 is about 40691.2187209968. The cubic root of 1655775281 is about 1183.0428221758.

The spelling of 1655775281 in words is "one billion, six hundred fifty-five million, seven hundred seventy-five thousand, two hundred eighty-one".