1261541711 has 4 divisors (see below), whose sum is σ = 1288383072. Its totient is φ = 1234700352.

The previous prime is 1261541707. The next prime is 1261541719. The reversal of 1261541711 is 1171451621.

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

It is a cyclic number.

It is not a de Polignac number, because 1261541711 - 2² = 1261541707 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261541719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13420610 + ... + 13420703.

It is an arithmetic number, because the mean of its divisors is an integer number (322095768).

Almost surely, 2^1261541711 is an apocalyptic number.

1261541711 is a deficient number, since it is larger than the sum of its proper divisors (26841361).

1261541711 is an equidigital number, since it uses as much as digits as its factorization.

1261541711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26841360.

The product of its digits is 1680, while the sum is 29.

The square root of 1261541711 is about 35518.1884532418. The cubic root of 1261541711 is about 1080.5226411291.

The spelling of 1261541711 in words is "one billion, two hundred sixty-one million, five hundred forty-one thousand, seven hundred eleven".