921161723 has 2 divisors, whose sum is σ = 921161724. Its totient is φ = 921161722.

The previous prime is 921161701. The next prime is 921161777. The reversal of 921161723 is 327161129.

It is a weak prime.

It is an emirp because it is prime and its reverse (327161129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 921161723 - 2¹⁰ = 921160699 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 921161723.

It is not a weakly prime, because it can be changed into another prime (921161023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460580861 + 460580862.

It is an arithmetic number, because the mean of its divisors is an integer number (460580862).

Almost surely, 2^921161723 is an apocalyptic number.

921161723 is a deficient number, since it is larger than the sum of its proper divisors (1).

921161723 is an equidigital number, since it uses as much as digits as its factorization.

921161723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 32.

The square root of 921161723 is about 30350.6461710455. The cubic root of 921161723 is about 972.9980304074.

It can be divided in two parts, 92116 and 1723, that added together give a palindrome (93839).

The spelling of 921161723 in words is "nine hundred twenty-one million, one hundred sixty-one thousand, seven hundred twenty-three".