997982669 has 2 divisors, whose sum is σ = 997982670. Its totient is φ = 997982668.

The previous prime is 997982653. The next prime is 997982837. The reversal of 997982669 is 966289799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 581292100 + 416690569 = 24110^2 + 20413^2 .

It is a cyclic number.

It is not a de Polignac number, because 997982669 - 2⁴ = 997982653 is a prime.

It is a super-2 number, since 2×997982669² = 1991938815248727122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997982639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498991334 + 498991335.

It is an arithmetic number, because the mean of its divisors is an integer number (498991335).

Almost surely, 2^997982669 is an apocalyptic number.

It is an amenable number.

997982669 is a deficient number, since it is larger than the sum of its proper divisors (1).

997982669 is an equidigital number, since it uses as much as digits as its factorization.

997982669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26453952, while the sum is 65.

The square root of 997982669 is about 31590.8636950622. The cubic root of 997982669 is about 999.3271036454.

The spelling of 997982669 in words is "nine hundred ninety-seven million, nine hundred eighty-two thousand, six hundred sixty-nine".