1156730921 has 2 divisors, whose sum is σ = 1156730922. Its totient is φ = 1156730920.

The previous prime is 1156730899. The next prime is 1156730923. The reversal of 1156730921 is 1290376511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1107225625 + 49505296 = 33275^2 + 7036^2 .

It is a cyclic number.

It is not a de Polignac number, because 1156730921 - 2⁶ = 1156730857 is a prime.

Together with 1156730923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1156730923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578365460 + 578365461.

It is an arithmetic number, because the mean of its divisors is an integer number (578365461).

Almost surely, 2^1156730921 is an apocalyptic number.

It is an amenable number.

1156730921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1156730921 is an equidigital number, since it uses as much as digits as its factorization.

1156730921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 1156730921 is about 34010.7471396910. The cubic root of 1156730921 is about 1049.7296117079.

The spelling of 1156730921 in words is "one billion, one hundred fifty-six million, seven hundred thirty thousand, nine hundred twenty-one".