61393889 has 2 divisors, whose sum is σ = 61393890. Its totient is φ = 61393888.

The previous prime is 61393867. The next prime is 61393901. The reversal of 61393889 is 98839316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60964864 + 429025 = 7808^2 + 655^2 .

It is a cyclic number.

It is not a de Polignac number, because 61393889 - 2¹² = 61389793 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61393859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30696944 + 30696945.

It is an arithmetic number, because the mean of its divisors is an integer number (30696945).

Almost surely, 2^61393889 is an apocalyptic number.

It is an amenable number.

61393889 is a deficient number, since it is larger than the sum of its proper divisors (1).

61393889 is an equidigital number, since it uses as much as digits as its factorization.

61393889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 47.

The square root of 61393889 is about 7835.4252596780. The cubic root of 61393889 is about 394.4951923392.

The spelling of 61393889 in words is "sixty-one million, three hundred ninety-three thousand, eight hundred eighty-nine".