61028389 has 2 divisors, whose sum is σ = 61028390. Its totient is φ = 61028388.

The previous prime is 61028353. The next prime is 61028393. The reversal of 61028389 is 98382016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58522500 + 2505889 = 7650^2 + 1583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61028389 is a prime.

It is a zygodrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61028329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30514194 + 30514195.

It is an arithmetic number, because the mean of its divisors is an integer number (30514195).

Almost surely, 2^61028389 is an apocalyptic number.

It is an amenable number.

61028389 is a deficient number, since it is larger than the sum of its proper divisors (1).

61028389 is an equidigital number, since it uses as much as digits as its factorization.

61028389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 61028389 is about 7812.0668839943. The cubic root of 61028389 is about 393.7107761718.

The spelling of 61028389 in words is "sixty-one million, twenty-eight thousand, three hundred eighty-nine".