1266163531 has 4 divisors (see below), whose sum is σ = 1277368632. Its totient is φ = 1254958432.

The previous prime is 1266163529. The next prime is 1266163537. The reversal of 1266163531 is 1353616621.

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 1266163531 - 2¹ = 1266163529 is a prime.

It is a super-2 number, since 2×1266163531² = 3206340174468775922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266163537) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 5602381 + ... + 5602606.

It is an arithmetic number, because the mean of its divisors is an integer number (319342158).

Almost surely, 2^1266163531 is an apocalyptic number.

1266163531 is a deficient number, since it is larger than the sum of its proper divisors (11205101).

1266163531 is a wasteful number, since it uses less digits than its factorization.

1266163531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11205100.

The product of its digits is 19440, while the sum is 34.

The square root of 1266163531 is about 35583.1916921459. The cubic root of 1266163531 is about 1081.8405774276.

The spelling of 1266163531 in words is "one billion, two hundred sixty-six million, one hundred sixty-three thousand, five hundred thirty-one".