61645061 has 2 divisors, whose sum is σ = 61645062. Its totient is φ = 61645060.

The previous prime is 61645033. The next prime is 61645079. The reversal of 61645061 is 16054616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33756100 + 27888961 = 5810^2 + 5281^2 .

It is a cyclic number.

It is not a de Polignac number, because 61645061 - 2¹⁸ = 61382917 is a prime.

It is a super-2 number, since 2×61645061² = 7600227091387442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61645021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30822530 + 30822531.

It is an arithmetic number, because the mean of its divisors is an integer number (30822531).

Almost surely, 2^61645061 is an apocalyptic number.

It is an amenable number.

61645061 is a deficient number, since it is larger than the sum of its proper divisors (1).

61645061 is an equidigital number, since it uses as much as digits as its factorization.

61645061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 61645061 is about 7851.4368748656. The cubic root of 61645061 is about 395.0324408543.

Adding to 61645061 its reverse (16054616), we get a palindrome (77699677).

The spelling of 61645061 in words is "sixty-one million, six hundred forty-five thousand, sixty-one".