1261411055 has 4 divisors (see below), whose sum is σ = 1513693272. Its totient is φ = 1009128840.

The previous prime is 1261411013. The next prime is 1261411061. The reversal of 1261411055 is 5501141621.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1261411055 - 2²⁶ = 1194302191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126141101 + ... + 126141110.

It is an arithmetic number, because the mean of its divisors is an integer number (378423318).

Almost surely, 2^1261411055 is an apocalyptic number.

1261411055 is a deficient number, since it is larger than the sum of its proper divisors (252282217).

1261411055 is an equidigital number, since it uses as much as digits as its factorization.

1261411055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252282216.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1261411055 is about 35516.3491226224. The cubic root of 1261411055 is about 1080.4853371333.

Adding to 1261411055 its reverse (5501141621), we get a palindrome (6762552676).

The spelling of 1261411055 in words is "one billion, two hundred sixty-one million, four hundred eleven thousand, fifty-five".