61443691 has 2 divisors, whose sum is σ = 61443692. Its totient is φ = 61443690.

The previous prime is 61443671. The next prime is 61443703. The reversal of 61443691 is 19634416.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61443691 - 2⁷ = 61443563 is a prime.

It is not a weakly prime, because it can be changed into another prime (61443601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30721845 + 30721846.

It is an arithmetic number, because the mean of its divisors is an integer number (30721846).

Almost surely, 2^61443691 is an apocalyptic number.

61443691 is a deficient number, since it is larger than the sum of its proper divisors (1).

61443691 is an equidigital number, since it uses as much as digits as its factorization.

61443691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 61443691 is about 7838.6026178140. The cubic root of 61443691 is about 394.6018334610.

The spelling of 61443691 in words is "sixty-one million, four hundred forty-three thousand, six hundred ninety-one".