1261111041 has 12 divisors (see below), whose sum is σ = 1821935232. Its totient is φ = 840588216.

The previous prime is 1261111013. The next prime is 1261111067. The reversal of 1261111041 is 1401111621.

1261111041 is a `hidden beast` number, since 1 + 2 + 611 + 1 + 10 + 41 = 666.

It is not a de Polignac number, because 1261111041 - 2¹³ = 1261102849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1261111001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64120 + ... + 81446.

It is an arithmetic number, because the mean of its divisors is an integer number (151827936).

Almost surely, 2^1261111041 is an apocalyptic number.

It is an amenable number.

1261111041 is a deficient number, since it is larger than the sum of its proper divisors (560824191).

1261111041 is a wasteful number, since it uses less digits than its factorization.

1261111041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25420 (or 25417 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

The square root of 1261111041 is about 35512.1252672943. The cubic root of 1261111041 is about 1080.3996694652.

Adding to 1261111041 its reverse (1401111621), we get a palindrome (2662222662).

The spelling of 1261111041 in words is "one billion, two hundred sixty-one million, one hundred eleven thousand, forty-one".