997471109 has 2 divisors, whose sum is σ = 997471110. Its totient is φ = 997471108.

The previous prime is 997471093. The next prime is 997471171. The reversal of 997471109 is 901174799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 930067009 + 67404100 = 30497^2 + 8210^2 .

It is a cyclic number.

It is not a de Polignac number, because 997471109 - 2⁴ = 997471093 is a prime.

It is a super-2 number, since 2×997471109² = 1989897226579379762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997471309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498735554 + 498735555.

It is an arithmetic number, because the mean of its divisors is an integer number (498735555).

Almost surely, 2^997471109 is an apocalyptic number.

It is an amenable number.

997471109 is a deficient number, since it is larger than the sum of its proper divisors (1).

997471109 is an equidigital number, since it uses as much as digits as its factorization.

997471109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142884, while the sum is 47.

The square root of 997471109 is about 31582.7660124949. The cubic root of 997471109 is about 999.1563247456.

The spelling of 997471109 in words is "nine hundred ninety-seven million, four hundred seventy-one thousand, one hundred nine".