874923919721 has 2 divisors, whose sum is σ = 874923919722. Its totient is φ = 874923919720.

The previous prime is 874923919711. The next prime is 874923919747. The reversal of 874923919721 is 127919329478.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 758229943696 + 116693976025 = 870764^2 + 341605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-874923919721 is a prime.

It is not a weakly prime, because it can be changed into another prime (874923919711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 437461959860 + 437461959861.

It is an arithmetic number, because the mean of its divisors is an integer number (437461959861).

Almost surely, 2^874923919721 is an apocalyptic number.

It is an amenable number.

874923919721 is a deficient number, since it is larger than the sum of its proper divisors (1).

874923919721 is an equidigital number, since it uses as much as digits as its factorization.

874923919721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13716864, while the sum is 62.

The spelling of 874923919721 in words is "eight hundred seventy-four billion, nine hundred twenty-three million, nine hundred nineteen thousand, seven hundred twenty-one".