997691041 has 2 divisors, whose sum is σ = 997691042. Its totient is φ = 997691040.

The previous prime is 997690997. The next prime is 997691059. The reversal of 997691041 is 140196799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 534580641 + 463110400 = 23121^2 + 21520^2 .

It is a cyclic number.

It is not a de Polignac number, because 997691041 - 2⁷ = 997690913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 997690982 and 997691000.

It is not a weakly prime, because it can be changed into another prime (997691341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498845520 + 498845521.

It is an arithmetic number, because the mean of its divisors is an integer number (498845521).

Almost surely, 2^997691041 is an apocalyptic number.

It is an amenable number.

997691041 is a deficient number, since it is larger than the sum of its proper divisors (1).

997691041 is an equidigital number, since it uses as much as digits as its factorization.

997691041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 997691041 is about 31586.2476562190. The cubic root of 997691041 is about 999.2297538732.

The spelling of 997691041 in words is "nine hundred ninety-seven million, six hundred ninety-one thousand, forty-one".