61881697 has 2 divisors, whose sum is σ = 61881698. Its totient is φ = 61881696.

The previous prime is 61881671. The next prime is 61881709. The reversal of 61881697 is 79618816.

61881697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60202081 + 1679616 = 7759^2 + 1296^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61881697 is a prime.

It is not a weakly prime, because it can be changed into another prime (61831697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30940848 + 30940849.

It is an arithmetic number, because the mean of its divisors is an integer number (30940849).

Almost surely, 2^61881697 is an apocalyptic number.

It is an amenable number.

61881697 is a deficient number, since it is larger than the sum of its proper divisors (1).

61881697 is an equidigital number, since it uses as much as digits as its factorization.

61881697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 46.

The square root of 61881697 is about 7866.4920390222. The cubic root of 61881697 is about 395.5372638823.

The spelling of 61881697 in words is "sixty-one million, eight hundred eighty-one thousand, six hundred ninety-seven".