997859477 has 2 divisors, whose sum is σ = 997859478. Its totient is φ = 997859476.

The previous prime is 997859459. The next prime is 997859543. The reversal of 997859477 is 774958799.

997859477 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 can be written as a sum of positive squares in only one way, i.e., 503508721 + 494350756 = 22439^2 + 22234^2 .

It is a cyclic number.

It is not a de Polignac number, because 997859477 - 2⁶ = 997859413 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 (997859437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498929738 + 498929739.

It is an arithmetic number, because the mean of its divisors is an integer number (498929739).

Almost surely, 2^997859477 is an apocalyptic number.

It is an amenable number.

997859477 is a deficient number, since it is larger than the sum of its proper divisors (1).

997859477 is an equidigital number, since it uses as much as digits as its factorization.

997859477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40007520, while the sum is 65.

The square root of 997859477 is about 31588.9138306463. The cubic root of 997859477 is about 999.2859826339.

The spelling of 997859477 in words is "nine hundred ninety-seven million, eight hundred fifty-nine thousand, four hundred seventy-seven".