61897091 has 2 divisors, whose sum is σ = 61897092. Its totient is φ = 61897090.

The previous prime is 61897027. The next prime is 61897139. The reversal of 61897091 is 19079816.

It is a happy number.

61897091 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 is a cyclic number.

It is not a de Polignac number, because 61897091 - 2⁶ = 61897027 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61897021) 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, 30948545 + 30948546.

It is an arithmetic number, because the mean of its divisors is an integer number (30948546).

Almost surely, 2^61897091 is an apocalyptic number.

61897091 is a deficient number, since it is larger than the sum of its proper divisors (1).

61897091 is an equidigital number, since it uses as much as digits as its factorization.

61897091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 61897091 is about 7867.4704321020. The cubic root of 61897091 is about 395.5700597714.

The spelling of 61897091 in words is "sixty-one million, eight hundred ninety-seven thousand, ninety-one".