61212643 has 2 divisors, whose sum is σ = 61212644. Its totient is φ = 61212642.

The previous prime is 61212587. The next prime is 61212653. The reversal of 61212643 is 34621216.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61212643 is a prime.

It is not a weakly prime, because it can be changed into another prime (61212653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30606321 + 30606322.

It is an arithmetic number, because the mean of its divisors is an integer number (30606322).

Almost surely, 2^61212643 is an apocalyptic number.

61212643 is a deficient number, since it is larger than the sum of its proper divisors (1).

61212643 is an equidigital number, since it uses as much as digits as its factorization.

61212643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

The square root of 61212643 is about 7823.8509060436. The cubic root of 61212643 is about 394.1066023484.

Adding to 61212643 its reverse (34621216), we get a palindrome (95833859).

The spelling of 61212643 in words is "sixty-one million, two hundred twelve thousand, six hundred forty-three".