1211934091 has 2 divisors, whose sum is σ = 1211934092. Its totient is φ = 1211934090.

The previous prime is 1211934083. The next prime is 1211934121. The reversal of 1211934091 is 1904391121.

It is a weak prime.

It is an emirp because it is prime and its reverse (1904391121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211934091 - 2³ = 1211934083 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211934071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605967045 + 605967046.

It is an arithmetic number, because the mean of its divisors is an integer number (605967046).

Almost surely, 2^1211934091 is an apocalyptic number.

1211934091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211934091 is an equidigital number, since it uses as much as digits as its factorization.

1211934091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1211934091 is about 34812.8437649095. The cubic root of 1211934091 is about 1066.1696953255.

The spelling of 1211934091 in words is "one billion, two hundred eleven million, nine hundred thirty-four thousand, ninety-one".