997004861 has 2 divisors, whose sum is σ = 997004862. Its totient is φ = 997004860.

The previous prime is 997004839. The next prime is 997004867. The reversal of 997004861 is 168400799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 599760100 + 397244761 = 24490^2 + 19931^2 .

It is a cyclic number.

It is not a de Polignac number, because 997004861 - 2¹⁰ = 997003837 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997004867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498502430 + 498502431.

It is an arithmetic number, because the mean of its divisors is an integer number (498502431).

Almost surely, 2^997004861 is an apocalyptic number.

It is an amenable number.

997004861 is a deficient number, since it is larger than the sum of its proper divisors (1).

997004861 is an equidigital number, since it uses as much as digits as its factorization.

997004861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 997004861 is about 31575.3837823074. The cubic root of 997004861 is about 999.0006219095. Note that the first 3 decimals are identical.

The spelling of 997004861 in words is "nine hundred ninety-seven million, four thousand, eight hundred sixty-one".