1121992621 has 2 divisors, whose sum is σ = 1121992622. Its totient is φ = 1121992620.

The previous prime is 1121992609. The next prime is 1121992643. The reversal of 1121992621 is 1262991211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 925011396 + 196981225 = 30414^2 + 14035^2 .

It is an emirp because it is prime and its reverse (1262991211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1121992621 - 2¹⁹ = 1121468333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121992661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560996310 + 560996311.

It is an arithmetic number, because the mean of its divisors is an integer number (560996311).

Almost surely, 2^1121992621 is an apocalyptic number.

It is an amenable number.

1121992621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121992621 is an equidigital number, since it uses as much as digits as its factorization.

1121992621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 34.

The square root of 1121992621 is about 33496.1583021098. The cubic root of 1121992621 is about 1039.1143288724.

The spelling of 1121992621 in words is "one billion, one hundred twenty-one million, nine hundred ninety-two thousand, six hundred twenty-one".