61585889 has 2 divisors, whose sum is σ = 61585890. Its totient is φ = 61585888.

The previous prime is 61585831. The next prime is 61585891. The reversal of 61585889 is 98858516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57259489 + 4326400 = 7567^2 + 2080^2 .

It is a cyclic number.

It is not a de Polignac number, because 61585889 - 2⁸ = 61585633 is a prime.

Together with 61585891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61582889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30792944 + 30792945.

It is an arithmetic number, because the mean of its divisors is an integer number (30792945).

Almost surely, 2^61585889 is an apocalyptic number.

It is an amenable number.

61585889 is a deficient number, since it is larger than the sum of its proper divisors (1).

61585889 is an equidigital number, since it uses as much as digits as its factorization.

61585889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 691200, while the sum is 50.

The square root of 61585889 is about 7847.6677427118. The cubic root of 61585889 is about 394.9060055149.

The spelling of 61585889 in words is "sixty-one million, five hundred eighty-five thousand, eight hundred eighty-nine".