1281548101 has 2 divisors, whose sum is σ = 1281548102. Its totient is φ = 1281548100.

The previous prime is 1281548089. The next prime is 1281548117. The reversal of 1281548101 is 1018451821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1164583876 + 116964225 = 34126^2 + 10815^2 .

It is a cyclic number.

It is not a de Polignac number, because 1281548101 - 2¹¹ = 1281546053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1281548131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640774050 + 640774051.

It is an arithmetic number, because the mean of its divisors is an integer number (640774051).

Almost surely, 2^1281548101 is an apocalyptic number.

It is an amenable number.

1281548101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281548101 is an equidigital number, since it uses as much as digits as its factorization.

1281548101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2560, while the sum is 31.

The square root of 1281548101 is about 35798.7164714044. The cubic root of 1281548101 is about 1086.2045986843.

Adding to 1281548101 its reverse (1018451821), we get a palindrome (2299999922).

The spelling of 1281548101 in words is "one billion, two hundred eighty-one million, five hundred forty-eight thousand, one hundred one".