1266431099 has 8 divisors (see below), whose sum is σ = 1341241920. Its totient is φ = 1191655296.

The previous prime is 1266431093. The next prime is 1266431171. The reversal of 1266431099 is 9901346621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1266431099 - 2⁸ = 1266430843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266431093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119582 + ... + 129740.

It is an arithmetic number, because the mean of its divisors is an integer number (167655240).

Almost surely, 2^1266431099 is an apocalyptic number.

1266431099 is a deficient number, since it is larger than the sum of its proper divisors (74810821).

1266431099 is a wasteful number, since it uses less digits than its factorization.

1266431099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17509.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 1266431099 is about 35586.9512462082. The cubic root of 1266431099 is about 1081.9167775721.

The spelling of 1266431099 in words is "one billion, two hundred sixty-six million, four hundred thirty-one thousand, ninety-nine".