1921370723 has 2 divisors, whose sum is σ = 1921370724. Its totient is φ = 1921370722.

The previous prime is 1921370707. The next prime is 1921370749. The reversal of 1921370723 is 3270731291.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1921370723 - 2⁴ = 1921370707 is a prime.

It is not a weakly prime, because it can be changed into another prime (1921370783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960685361 + 960685362.

It is an arithmetic number, because the mean of its divisors is an integer number (960685362).

Almost surely, 2^1921370723 is an apocalyptic number.

1921370723 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921370723 is an equidigital number, since it uses as much as digits as its factorization.

1921370723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 1921370723 is about 43833.4429745143. The cubic root of 1921370723 is about 1243.1887066802.

The spelling of 1921370723 in words is "one billion, nine hundred twenty-one million, three hundred seventy thousand, seven hundred twenty-three".