997729069 has 2 divisors, whose sum is σ = 997729070. Its totient is φ = 997729068.

The previous prime is 997729063. The next prime is 997729091. The reversal of 997729069 is 960927799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 972628969 + 25100100 = 31187^2 + 5010^2 .

It is a cyclic number.

It is not a de Polignac number, because 997729069 - 2¹³ = 997720877 is a prime.

It is a super-2 number, since 2×997729069² = 1990926590255213522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997729063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498864534 + 498864535.

It is an arithmetic number, because the mean of its divisors is an integer number (498864535).

Almost surely, 2^997729069 is an apocalyptic number.

It is an amenable number.

997729069 is a deficient number, since it is larger than the sum of its proper divisors (1).

997729069 is an equidigital number, since it uses as much as digits as its factorization.

997729069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3857868, while the sum is 58.

The square root of 997729069 is about 31586.8496213218. The cubic root of 997729069 is about 999.2424492618.

The spelling of 997729069 in words is "nine hundred ninety-seven million, seven hundred twenty-nine thousand, sixty-nine".