997851161 has 2 divisors, whose sum is σ = 997851162. Its totient is φ = 997851160.

The previous prime is 997851131. The next prime is 997851191. The reversal of 997851161 is 161158799.

It is a balanced prime because it is at equal distance from previous prime (997851131) and next prime (997851191).

It can be written as a sum of positive squares in only one way, i.e., 604225561 + 393625600 = 24581^2 + 19840^2 .

It is a cyclic number.

It is not a de Polignac number, because 997851161 - 2¹⁴ = 997834777 is a prime.

It is not a weakly prime, because it can be changed into another prime (997851121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498925580 + 498925581.

It is an arithmetic number, because the mean of its divisors is an integer number (498925581).

Almost surely, 2^997851161 is an apocalyptic number.

It is an amenable number.

997851161 is a deficient number, since it is larger than the sum of its proper divisors (1).

997851161 is an equidigital number, since it uses as much as digits as its factorization.

997851161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 47.

The square root of 997851161 is about 31588.7822019147. The cubic root of 997851161 is about 999.2832066634.

The spelling of 997851161 in words is "nine hundred ninety-seven million, eight hundred fifty-one thousand, one hundred sixty-one".