197057989 has 2 divisors, whose sum is σ = 197057990. Its totient is φ = 197057988.

The previous prime is 197057983. The next prime is 197058007. The reversal of 197057989 is 989750791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194602500 + 2455489 = 13950^2 + 1567^2 .

It is a cyclic number.

It is not a de Polignac number, because 197057989 - 2⁵ = 197057957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197057983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98528994 + 98528995.

It is an arithmetic number, because the mean of its divisors is an integer number (98528995).

Almost surely, 2^197057989 is an apocalyptic number.

It is an amenable number.

197057989 is a deficient number, since it is larger than the sum of its proper divisors (1).

197057989 is an equidigital number, since it uses as much as digits as its factorization.

197057989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1428840, while the sum is 55.

The square root of 197057989 is about 14037.7344682110. The cubic root of 197057989 is about 581.9218738003.

The spelling of 197057989 in words is "one hundred ninety-seven million, fifty-seven thousand, nine hundred eighty-nine".