997469777 has 2 divisors, whose sum is σ = 997469778. Its totient is φ = 997469776.

The previous prime is 997469723. The next prime is 997469779. The reversal of 997469777 is 777964799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 988222096 + 9247681 = 31436^2 + 3041^2 .

It is a cyclic number.

It is not a de Polignac number, because 997469777 - 2¹⁶ = 997404241 is a prime.

Together with 997469779, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (997469779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498734888 + 498734889.

It is an arithmetic number, because the mean of its divisors is an integer number (498734889).

Almost surely, 2^997469777 is an apocalyptic number.

It is an amenable number.

997469777 is a deficient number, since it is larger than the sum of its proper divisors (1).

997469777 is an equidigital number, since it uses as much as digits as its factorization.

997469777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42007896, while the sum is 65.

The square root of 997469777 is about 31582.7449250378. The cubic root of 997469777 is about 999.1558799952.

The spelling of 997469777 in words is "nine hundred ninety-seven million, four hundred sixty-nine thousand, seven hundred seventy-seven".