921363997 has 2 divisors, whose sum is σ = 921363998. Its totient is φ = 921363996.

The previous prime is 921363917. The next prime is 921364009. The reversal of 921363997 is 799363129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 915728121 + 5635876 = 30261^2 + 2374^2 .

It is a cyclic number.

It is not a de Polignac number, because 921363997 - 2¹¹ = 921361949 is a prime.

It is a super-2 number, since 2×921363997² = 1697823229935632018, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 921363997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921363917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460681998 + 460681999.

It is an arithmetic number, because the mean of its divisors is an integer number (460681999).

Almost surely, 2^921363997 is an apocalyptic number.

It is an amenable number.

921363997 is a deficient number, since it is larger than the sum of its proper divisors (1).

921363997 is an equidigital number, since it uses as much as digits as its factorization.

921363997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 551124, while the sum is 49.

The square root of 921363997 is about 30353.9782730370. The cubic root of 921363997 is about 973.0692440335.

The spelling of 921363997 in words is "nine hundred twenty-one million, three hundred sixty-three thousand, nine hundred ninety-seven".