1240261261 has 2 divisors, whose sum is σ = 1240261262. Its totient is φ = 1240261260.

The previous prime is 1240261189. The next prime is 1240261291. The reversal of 1240261261 is 1621620421.

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., 682829161 + 557432100 = 26131^2 + 23610^2 .

It is an emirp because it is prime and its reverse (1621620421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1240261261 - 2⁷ = 1240261133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240261291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620130630 + 620130631.

It is an arithmetic number, because the mean of its divisors is an integer number (620130631).

Almost surely, 2^1240261261 is an apocalyptic number.

It is an amenable number.

1240261261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240261261 is an equidigital number, since it uses as much as digits as its factorization.

1240261261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1240261261 is about 35217.3431848571. The cubic root of 1240261261 is about 1074.4125179425.

Adding to 1240261261 its reverse (1621620421), we get a palindrome (2861881682).

The spelling of 1240261261 in words is "one billion, two hundred forty million, two hundred sixty-one thousand, two hundred sixty-one".