61621589 has 2 divisors, whose sum is σ = 61621590. Its totient is φ = 61621588.

The previous prime is 61621517. The next prime is 61621597. The reversal of 61621589 is 98512616.

61621589 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., 59752900 + 1868689 = 7730^2 + 1367^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61621589 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61621489) 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, 30810794 + 30810795.

It is an arithmetic number, because the mean of its divisors is an integer number (30810795).

Almost surely, 2^61621589 is an apocalyptic number.

It is an amenable number.

61621589 is a deficient number, since it is larger than the sum of its proper divisors (1).

61621589 is an equidigital number, since it uses as much as digits as its factorization.

61621589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 38.

The square root of 61621589 is about 7849.9419743078. The cubic root of 61621589 is about 394.9822969153.

The spelling of 61621589 in words is "sixty-one million, six hundred twenty-one thousand, five hundred eighty-nine".