161635741 has 2 divisors, whose sum is σ = 161635742. Its totient is φ = 161635740.

The previous prime is 161635729. The next prime is 161635759. The reversal of 161635741 is 147536161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134073241 + 27562500 = 11579^2 + 5250^2 .

It is a cyclic number.

It is not a de Polignac number, because 161635741 - 2⁵ = 161635709 is a prime.

It is a super-2 number, since 2×161635741² = 52252225537238162, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161635697 and 161635706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161635141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80817870 + 80817871.

It is an arithmetic number, because the mean of its divisors is an integer number (80817871).

Almost surely, 2^161635741 is an apocalyptic number.

It is an amenable number.

161635741 is a deficient number, since it is larger than the sum of its proper divisors (1).

161635741 is an equidigital number, since it uses as much as digits as its factorization.

161635741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 34.

The square root of 161635741 is about 12713.6045636161. The cubic root of 161635741 is about 544.7272894241.

It can be divided in two parts, 16163 and 5741, that added together give a square (21904 = 148²).

The spelling of 161635741 in words is "one hundred sixty-one million, six hundred thirty-five thousand, seven hundred forty-one".