1272601261 has 2 divisors, whose sum is σ = 1272601262. Its totient is φ = 1272601260.

The previous prime is 1272601241. The next prime is 1272601303. The reversal of 1272601261 is 1621062721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1142778025 + 129823236 = 33805^2 + 11394^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272601261 - 2¹⁹ = 1272076973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1272601241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636300630 + 636300631.

It is an arithmetic number, because the mean of its divisors is an integer number (636300631).

Almost surely, 2^1272601261 is an apocalyptic number.

It is an amenable number.

1272601261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272601261 is an equidigital number, since it uses as much as digits as its factorization.

1272601261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1272601261 is about 35673.5372650372. The cubic root of 1272601261 is about 1083.6709958297.

Adding to 1272601261 its reverse (1621062721), we get a palindrome (2893663982).

The spelling of 1272601261 in words is "one billion, two hundred seventy-two million, six hundred one thousand, two hundred sixty-one".