997738901 has 2 divisors, whose sum is σ = 997738902. Its totient is φ = 997738900.

The previous prime is 997738883. The next prime is 997738949. The reversal of 997738901 is 109837799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 954192100 + 43546801 = 30890^2 + 6599^2 .

It is a cyclic number.

It is not a de Polignac number, because 997738901 - 2¹⁰ = 997737877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997738981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498869450 + 498869451.

It is an arithmetic number, because the mean of its divisors is an integer number (498869451).

Almost surely, 2^997738901 is an apocalyptic number.

It is an amenable number.

997738901 is a deficient number, since it is larger than the sum of its proper divisors (1).

997738901 is an equidigital number, since it uses as much as digits as its factorization.

997738901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 857304, while the sum is 53.

The square root of 997738901 is about 31587.0052553261. The cubic root of 997738901 is about 999.2457315555.

The spelling of 997738901 in words is "nine hundred ninety-seven million, seven hundred thirty-eight thousand, nine hundred one".