61861061 has 2 divisors, whose sum is σ = 61861062. Its totient is φ = 61861060.

The previous prime is 61861057. The next prime is 61861081. The reversal of 61861061 is 16016816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61230625 + 630436 = 7825^2 + 794^2 .

It is a cyclic number.

It is not a de Polignac number, because 61861061 - 2² = 61861057 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61861001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30930530 + 30930531.

It is an arithmetic number, because the mean of its divisors is an integer number (30930531).

Almost surely, 2^61861061 is an apocalyptic number.

It is an amenable number.

61861061 is a deficient number, since it is larger than the sum of its proper divisors (1).

61861061 is an equidigital number, since it uses as much as digits as its factorization.

61861061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 61861061 is about 7865.1802903684. The cubic root of 61861061 is about 395.4932917288.

Adding to 61861061 its reverse (16016816), we get a palindrome (77877877).

The spelling of 61861061 in words is "sixty-one million, eight hundred sixty-one thousand, sixty-one".