61540169 has 2 divisors, whose sum is σ = 61540170. Its totient is φ = 61540168.

The previous prime is 61540163. The next prime is 61540211. The reversal of 61540169 is 96104516.

61540169 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43731769 + 17808400 = 6613^2 + 4220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61540169 is a prime.

It is a super-2 number, since 2×61540169² = 7574384801097122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61540163) 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, 30770084 + 30770085.

It is an arithmetic number, because the mean of its divisors is an integer number (30770085).

Almost surely, 2^61540169 is an apocalyptic number.

It is an amenable number.

61540169 is a deficient number, since it is larger than the sum of its proper divisors (1).

61540169 is an equidigital number, since it uses as much as digits as its factorization.

61540169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 61540169 is about 7844.7542345188. The cubic root of 61540169 is about 394.8082581651.

The spelling of 61540169 in words is "sixty-one million, five hundred forty thousand, one hundred sixty-nine".