989894057 has 2 divisors, whose sum is σ = 989894058. Its totient is φ = 989894056.

The previous prime is 989894047. The next prime is 989894069. The reversal of 989894057 is 750498989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 889172761 + 100721296 = 29819^2 + 10036^2 .

It is a cyclic number.

It is not a de Polignac number, because 989894057 - 2¹⁸ = 989631913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 989893987 and 989894005.

It is not a weakly prime, because it can be changed into another prime (989894047) 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, 494947028 + 494947029.

It is an arithmetic number, because the mean of its divisors is an integer number (494947029).

Almost surely, 2^989894057 is an apocalyptic number.

It is an amenable number.

989894057 is a deficient number, since it is larger than the sum of its proper divisors (1).

989894057 is an equidigital number, since it uses as much as digits as its factorization.

989894057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6531840, while the sum is 59.

The square root of 989894057 is about 31462.5818552769. The cubic root of 989894057 is about 996.6199404026.

The spelling of 989894057 in words is "nine hundred eighty-nine million, eight hundred ninety-four thousand, fifty-seven".