61609589 has 2 divisors, whose sum is σ = 61609590. Its totient is φ = 61609588.

The previous prime is 61609579. The next prime is 61609619. The reversal of 61609589 is 98590616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61105489 + 504100 = 7817^2 + 710^2 .

It is a cyclic number.

It is not a de Polignac number, because 61609589 - 2⁸ = 61609333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61609549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30804794 + 30804795.

It is an arithmetic number, because the mean of its divisors is an integer number (30804795).

Almost surely, 2^61609589 is an apocalyptic number.

It is an amenable number.

61609589 is a deficient number, since it is larger than the sum of its proper divisors (1).

61609589 is an equidigital number, since it uses as much as digits as its factorization.

61609589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 61609589 is about 7849.1776002330. The cubic root of 61609589 is about 394.9566560355.

The spelling of 61609589 in words is "sixty-one million, six hundred nine thousand, five hundred eighty-nine".