61619161 has 2 divisors, whose sum is σ = 61619162. Its totient is φ = 61619160.

The previous prime is 61619149. The next prime is 61619177. The reversal of 61619161 is 16191616.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54760000 + 6859161 = 7400^2 + 2619^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61619161 is a prime.

It is not a weakly prime, because it can be changed into another prime (61619111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30809580 + 30809581.

It is an arithmetic number, because the mean of its divisors is an integer number (30809581).

Almost surely, 2^61619161 is an apocalyptic number.

It is an amenable number.

61619161 is a deficient number, since it is larger than the sum of its proper divisors (1).

61619161 is an equidigital number, since it uses as much as digits as its factorization.

61619161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 31.

The square root of 61619161 is about 7849.7873219597. The cubic root of 61619161 is about 394.9771091793.

The spelling of 61619161 in words is "sixty-one million, six hundred nineteen thousand, one hundred sixty-one".