61389787 has 2 divisors, whose sum is σ = 61389788. Its totient is φ = 61389786.

The previous prime is 61389763. The next prime is 61389793. The reversal of 61389787 is 78798316.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61389787 - 2⁷ = 61389659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61389787.

It is not a weakly prime, because it can be changed into another prime (61389707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30694893 + 30694894.

It is an arithmetic number, because the mean of its divisors is an integer number (30694894).

Almost surely, 2^61389787 is an apocalyptic number.

61389787 is a deficient number, since it is larger than the sum of its proper divisors (1).

61389787 is an equidigital number, since it uses as much as digits as its factorization.

61389787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 49.

The square root of 61389787 is about 7835.1634954224. The cubic root of 61389787 is about 394.4864061481.

The spelling of 61389787 in words is "sixty-one million, three hundred eighty-nine thousand, seven hundred eighty-seven".