1265180101 has 2 divisors, whose sum is σ = 1265180102. Its totient is φ = 1265180100.

The previous prime is 1265180093. The next prime is 1265180107. The reversal of 1265180101 is 1010815621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 928420900 + 336759201 = 30470^2 + 18351^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265180101 - 2³ = 1265180093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265180107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632590050 + 632590051.

It is an arithmetic number, because the mean of its divisors is an integer number (632590051).

Almost surely, 2^1265180101 is an apocalyptic number.

It is an amenable number.

1265180101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265180101 is an equidigital number, since it uses as much as digits as its factorization.

1265180101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 25.

The square root of 1265180101 is about 35569.3702643159. The cubic root of 1265180101 is about 1081.5604161321.

Adding to 1265180101 its reverse (1010815621), we get a palindrome (2275995722).

The spelling of 1265180101 in words is "one billion, two hundred sixty-five million, one hundred eighty thousand, one hundred one".