161610061 has 2 divisors, whose sum is σ = 161610062. Its totient is φ = 161610060.

The previous prime is 161610023. The next prime is 161610073. The reversal of 161610061 is 160016161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152646025 + 8964036 = 12355^2 + 2994^2 .

It is a cyclic number.

It is not a de Polignac number, because 161610061 - 2⁷ = 161609933 is a prime.

It is a super-2 number, since 2×161610061² = 52235623632847442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161619061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80805030 + 80805031.

It is an arithmetic number, because the mean of its divisors is an integer number (80805031).

Almost surely, 2^161610061 is an apocalyptic number.

It is an amenable number.

161610061 is a deficient number, since it is larger than the sum of its proper divisors (1).

161610061 is an equidigital number, since it uses as much as digits as its factorization.

161610061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 161610061 is about 12712.5945817524. The cubic root of 161610061 is about 544.6984399102.

It can be divided in two parts, 1616100 and 61, that added together give a palindrome (1616161).

The spelling of 161610061 in words is "one hundred sixty-one million, six hundred ten thousand, sixty-one".