1261467771 has 4 divisors (see below), whose sum is σ = 1681957032. Its totient is φ = 840978512.

The previous prime is 1261467763. The next prime is 1261467793. The reversal of 1261467771 is 1777641621.

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 1261467771 - 2³ = 1261467763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1261467761) 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, 210244626 + ... + 210244631.

It is an arithmetic number, because the mean of its divisors is an integer number (420489258).

Almost surely, 2^1261467771 is an apocalyptic number.

1261467771 is a deficient number, since it is larger than the sum of its proper divisors (420489261).

1261467771 is an equidigital number, since it uses as much as digits as its factorization.

1261467771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420489260.

The product of its digits is 98784, while the sum is 42.

The square root of 1261467771 is about 35517.1475628322. The cubic root of 1261467771 is about 1080.5015306090.

The spelling of 1261467771 in words is "one billion, two hundred sixty-one million, four hundred sixty-seven thousand, seven hundred seventy-one".