61910161 has 2 divisors, whose sum is σ = 61910162. Its totient is φ = 61910160.

The previous prime is 61910159. The next prime is 61910257. The reversal of 61910161 is 16101916.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52417600 + 9492561 = 7240^2 + 3081^2 .

It is a cyclic number.

It is not a de Polignac number, because 61910161 - 2¹ = 61910159 is a prime.

Together with 61910159, it forms a pair of twin primes.

It is a nialpdrome in base 13.

It is not a weakly prime, because it can be changed into another prime (61910111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30955080 + 30955081.

It is an arithmetic number, because the mean of its divisors is an integer number (30955081).

Almost surely, 2^61910161 is an apocalyptic number.

It is an amenable number.

61910161 is a deficient number, since it is larger than the sum of its proper divisors (1).

61910161 is an equidigital number, since it uses as much as digits as its factorization.

61910161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 61910161 is about 7868.3010237281. The cubic root of 61910161 is about 395.5979002657.

The spelling of 61910161 in words is "sixty-one million, nine hundred ten thousand, one hundred sixty-one".