1261106099 has 16 divisors (see below), whose sum is σ = 1392202080. Its totient is φ = 1132800000.

The previous prime is 1261106083. The next prime is 1261106117. The reversal of 1261106099 is 9906011621.

It is a cyclic number.

It is not a de Polignac number, because 1261106099 - 2⁴ = 1261106083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261106299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 786899 + ... + 788499.

It is an arithmetic number, because the mean of its divisors is an integer number (87012630).

Almost surely, 2^1261106099 is an apocalyptic number.

1261106099 is a deficient number, since it is larger than the sum of its proper divisors (131095981).

1261106099 is a wasteful number, since it uses less digits than its factorization.

1261106099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2422.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 1261106099 is about 35512.0556853585. The cubic root of 1261106099 is about 1080.3982581852.

The spelling of 1261106099 in words is "one billion, two hundred sixty-one million, one hundred six thousand, ninety-nine".