1145612261 has 2 divisors, whose sum is σ = 1145612262. Its totient is φ = 1145612260.

The previous prime is 1145612243. The next prime is 1145612309. The reversal of 1145612261 is 1622165411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 784840225 + 360772036 = 28015^2 + 18994^2 .

It is a cyclic number.

It is not a de Polignac number, because 1145612261 - 2⁶ = 1145612197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1145617261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572806130 + 572806131.

It is an arithmetic number, because the mean of its divisors is an integer number (572806131).

Almost surely, 2^1145612261 is an apocalyptic number.

It is an amenable number.

1145612261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145612261 is an equidigital number, since it uses as much as digits as its factorization.

1145612261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 29.

The square root of 1145612261 is about 33846.8944070206. The cubic root of 1145612261 is about 1046.3553945557.

Adding to 1145612261 its reverse (1622165411), we get a palindrome (2767777672).

The spelling of 1145612261 in words is "one billion, one hundred forty-five million, six hundred twelve thousand, two hundred sixty-one".