1261340041 has 16 divisors (see below), whose sum is σ = 1447470864. Its totient is φ = 1088815104.

The previous prime is 1261340039. The next prime is 1261340051. The reversal of 1261340041 is 1400431621.

It can be written as a sum of positive squares in 8 ways, for example, as 86564416 + 1174775625 = 9304^2 + 34275^2 .

It is not a de Polignac number, because 1261340041 - 2¹ = 1261340039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1261339994 and 1261340021.

It is not an unprimeable number, because it can be changed into a prime (1261340011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16521 + ... + 52873.

It is an arithmetic number, because the mean of its divisors is an integer number (90466929).

Almost surely, 2^1261340041 is an apocalyptic number.

It is an amenable number.

1261340041 is a deficient number, since it is larger than the sum of its proper divisors (186130823).

1261340041 is a wasteful number, since it uses less digits than its factorization.

1261340041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36540.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1261340041 is about 35515.3493717857. The cubic root of 1261340041 is about 1080.4650606275.

Adding to 1261340041 its reverse (1400431621), we get a palindrome (2661771662).

The spelling of 1261340041 in words is "one billion, two hundred sixty-one million, three hundred forty thousand, forty-one".