1161422921 has 2 divisors, whose sum is σ = 1161422922. Its totient is φ = 1161422920.

The previous prime is 1161422909. The next prime is 1161422923. The reversal of 1161422921 is 1292241611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 704318521 + 457104400 = 26539^2 + 21380^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161422921 - 2²² = 1157228617 is a prime.

It is a Sophie Germain prime.

Together with 1161422923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1161422923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580711460 + 580711461.

It is an arithmetic number, because the mean of its divisors is an integer number (580711461).

Almost surely, 2^1161422921 is an apocalyptic number.

It is an amenable number.

1161422921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161422921 is an equidigital number, since it uses as much as digits as its factorization.

1161422921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 1161422921 is about 34079.6555293624. The cubic root of 1161422921 is about 1051.1470219694.

The spelling of 1161422921 in words is "one billion, one hundred sixty-one million, four hundred twenty-two thousand, nine hundred twenty-one".