997933091 has 2 divisors, whose sum is σ = 997933092. Its totient is φ = 997933090.

The previous prime is 997933081. The next prime is 997933103. The reversal of 997933091 is 190339799.

It is a happy number.

997933091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997933091 - 2¹⁴ = 997916707 is a prime.

It is a super-2 number, since 2×997933091² = 1991740908225628562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (997933081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498966545 + 498966546.

It is an arithmetic number, because the mean of its divisors is an integer number (498966546).

Almost surely, 2^997933091 is an apocalyptic number.

997933091 is a deficient number, since it is larger than the sum of its proper divisors (1).

997933091 is an equidigital number, since it uses as much as digits as its factorization.

997933091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 413343, while the sum is 50.

The square root of 997933091 is about 31590.0789964191. The cubic root of 997933091 is about 999.3105551083.

The spelling of 997933091 in words is "nine hundred ninety-seven million, nine hundred thirty-three thousand, ninety-one".