1211011993 has 16 divisors (see below), whose sum is σ = 1278097920. Its totient is φ = 1145894400.

The previous prime is 1211011951. The next prime is 1211012021. The reversal of 1211011993 is 3991101121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211011993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211011093) 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, 358633 + ... + 361993.

It is an arithmetic number, because the mean of its divisors is an integer number (79881120).

Almost surely, 2^1211011993 is an apocalyptic number.

It is an amenable number.

1211011993 is a deficient number, since it is larger than the sum of its proper divisors (67085927).

1211011993 is a wasteful number, since it uses less digits than its factorization.

1211011993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3648.

The product of its (nonzero) digits is 486, while the sum is 28.

The square root of 1211011993 is about 34799.5975982482. The cubic root of 1211011993 is about 1065.8992289171.

The spelling of 1211011993 in words is "one billion, two hundred eleven million, eleven thousand, nine hundred ninety-three".