61646513 has 2 divisors, whose sum is σ = 61646514. Its totient is φ = 61646512.

The previous prime is 61646503. The next prime is 61646537. The reversal of 61646513 is 31564616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38539264 + 23107249 = 6208^2 + 4807^2 .

It is a cyclic number.

It is not a de Polignac number, because 61646513 - 2⁶ = 61646449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61646513.

It is not a weakly prime, because it can be changed into another prime (61646503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30823256 + 30823257.

It is an arithmetic number, because the mean of its divisors is an integer number (30823257).

Almost surely, 2^61646513 is an apocalyptic number.

It is an amenable number.

61646513 is a deficient number, since it is larger than the sum of its proper divisors (1).

61646513 is an equidigital number, since it uses as much as digits as its factorization.

61646513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 32.

The square root of 61646513 is about 7851.5293414723. The cubic root of 61646513 is about 395.0355423874.

The spelling of 61646513 in words is "sixty-one million, six hundred forty-six thousand, five hundred thirteen".