1231100099 has 2 divisors, whose sum is σ = 1231100100. Its totient is φ = 1231100098.

The previous prime is 1231100081. The next prime is 1231100137. The reversal of 1231100099 is 9900011321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231100099 - 2¹² = 1231096003 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231100029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615550049 + 615550050.

It is an arithmetic number, because the mean of its divisors is an integer number (615550050).

Almost surely, 2^1231100099 is an apocalyptic number.

1231100099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231100099 is an equidigital number, since it uses as much as digits as its factorization.

1231100099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 1231100099 is about 35087.0360532206. The cubic root of 1231100099 is about 1071.7606030894.

The spelling of 1231100099 in words is "one billion, two hundred thirty-one million, one hundred thousand, ninety-nine".