61115161 has 2 divisors, whose sum is σ = 61115162. Its totient is φ = 61115160.

The previous prime is 61115137. The next prime is 61115177. The reversal of 61115161 is 16151116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60918025 + 197136 = 7805^2 + 444^2 .

It is a cyclic number.

It is not a de Polignac number, because 61115161 - 2⁵ = 61115129 is a prime.

It is not a weakly prime, because it can be changed into another prime (61113161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30557580 + 30557581.

It is an arithmetic number, because the mean of its divisors is an integer number (30557581).

Almost surely, 2^61115161 is an apocalyptic number.

It is an amenable number.

61115161 is a deficient number, since it is larger than the sum of its proper divisors (1).

61115161 is an equidigital number, since it uses as much as digits as its factorization.

61115161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180, while the sum is 22.

The square root of 61115161 is about 7817.6186271780. The cubic root of 61115161 is about 393.8972844151.

Adding to 61115161 its reverse (16151116), we get a palindrome (77266277).

It can be divided in two parts, 6 and 1115161, that multiplied together give a palindrome (6690966).

The spelling of 61115161 in words is "sixty-one million, one hundred fifteen thousand, one hundred sixty-one".