61456643 has 2 divisors, whose sum is σ = 61456644. Its totient is φ = 61456642.

The previous prime is 61456631. The next prime is 61456657. The reversal of 61456643 is 34665416.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61456643 - 2⁶ = 61456579 is a prime.

It is not a weakly prime, because it can be changed into another prime (61456673) 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, 30728321 + 30728322.

It is an arithmetic number, because the mean of its divisors is an integer number (30728322).

Almost surely, 2^61456643 is an apocalyptic number.

61456643 is a deficient number, since it is larger than the sum of its proper divisors (1).

61456643 is an equidigital number, since it uses as much as digits as its factorization.

61456643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 35.

The square root of 61456643 is about 7839.4287419429. The cubic root of 61456643 is about 394.6295581620.

The spelling of 61456643 in words is "sixty-one million, four hundred fifty-six thousand, six hundred forty-three".