1211012993 has 4 divisors (see below), whose sum is σ = 1216348080. Its totient is φ = 1205677908.

The previous prime is 1211012821. The next prime is 1211013031. The reversal of 1211012993 is 3992101121.

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: 3992101121 = 27817 ⋅143513.

It is a cyclic number.

It is not a de Polignac number, because 1211012993 - 2²⁶ = 1143904129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211012393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2667203 + ... + 2667656.

It is an arithmetic number, because the mean of its divisors is an integer number (304087020).

Almost surely, 2^1211012993 is an apocalyptic number.

It is an amenable number.

1211012993 is a deficient number, since it is larger than the sum of its proper divisors (5335087).

1211012993 is an equidigital number, since it uses as much as digits as its factorization.

1211012993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5335086.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 1211012993 is about 34799.6119662274. The cubic root of 1211012993 is about 1065.8995223078.

The spelling of 1211012993 in words is "one billion, two hundred eleven million, twelve thousand, nine hundred ninety-three".