1261167286 has 4 divisors (see below), whose sum is σ = 1891750932. Its totient is φ = 630583642.

The previous prime is 1261167227. The next prime is 1261167307. The reversal of 1261167286 is 6827611621.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315291820 + ... + 315291823.

It is an arithmetic number, because the mean of its divisors is an integer number (472937733).

Almost surely, 2^1261167286 is an apocalyptic number.

1261167286 is a deficient number, since it is larger than the sum of its proper divisors (630583646).

1261167286 is an equidigital number, since it uses as much as digits as its factorization.

1261167286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630583645.

The product of its digits is 48384, while the sum is 40.

The square root of 1261167286 is about 35512.9171710802. The cubic root of 1261167286 is about 1080.4157310104.

It can be divided in two parts, 12611 and 67286, that added together give a palindrome (79897).

The spelling of 1261167286 in words is "one billion, two hundred sixty-one million, one hundred sixty-seven thousand, two hundred eighty-six".