61520843 has 2 divisors, whose sum is σ = 61520844. Its totient is φ = 61520842.

The previous prime is 61520839. The next prime is 61520867. The reversal of 61520843 is 34802516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61520843 - 2² = 61520839 is a prime.

It is not a weakly prime, because it can be changed into another prime (61520813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30760421 + 30760422.

It is an arithmetic number, because the mean of its divisors is an integer number (30760422).

Almost surely, 2^61520843 is an apocalyptic number.

61520843 is a deficient number, since it is larger than the sum of its proper divisors (1).

61520843 is an equidigital number, since it uses as much as digits as its factorization.

61520843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 61520843 is about 7843.5223592465. The cubic root of 61520843 is about 394.7669254693.

The spelling of 61520843 in words is "sixty-one million, five hundred twenty thousand, eight hundred forty-three".