1210100009 has 4 divisors (see below), whose sum is σ = 1211030016. Its totient is φ = 1209170004.

The previous prime is 1210099993. The next prime is 1210100027. The reversal of 1210100009 is 9000010121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9000010121 = 6047 ⋅1488343.

It is a cyclic number.

It is not a de Polignac number, because 1210100009 - 2⁴ = 1210099993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210099966 and 1210100002.

It is not an unprimeable number, because it can be changed into a prime (1210100029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463049 + ... + 465654.

It is an arithmetic number, because the mean of its divisors is an integer number (302757504).

Almost surely, 2^1210100009 is an apocalyptic number.

It is an amenable number.

1210100009 is a deficient number, since it is larger than the sum of its proper divisors (930007).

1210100009 is an equidigital number, since it uses as much as digits as its factorization.

1210100009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930006.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1210100009 is about 34786.4917604521. The cubic root of 1210100009 is about 1065.6315940333.

The spelling of 1210100009 in words is "one billion, two hundred ten million, one hundred thousand, nine".