921739480093 has 2 divisors, whose sum is σ = 921739480094. Its totient is φ = 921739480092.

The previous prime is 921739480069. The next prime is 921739480111. The reversal of 921739480093 is 390084937129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 869589820324 + 52149659769 = 932518^2 + 228363^2 .

It is an emirp because it is prime and its reverse (390084937129) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921739480093 is a prime.

It is a super-2 number, since 2×921739480093² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921739480393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460869740046 + 460869740047.

It is an arithmetic number, because the mean of its divisors is an integer number (460869740047).

Almost surely, 2^921739480093 is an apocalyptic number.

It is an amenable number.

921739480093 is a deficient number, since it is larger than the sum of its proper divisors (1).

921739480093 is an equidigital number, since it uses as much as digits as its factorization.

921739480093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The spelling of 921739480093 in words is "nine hundred twenty-one billion, seven hundred thirty-nine million, four hundred eighty thousand, ninety-three".