989913157 has 2 divisors, whose sum is σ = 989913158. Its totient is φ = 989913156.

The previous prime is 989913149. The next prime is 989913161. The reversal of 989913157 is 751319989.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 530196676 + 459716481 = 23026^2 + 21441^2 .

It is a cyclic number.

It is not a de Polignac number, because 989913157 - 2³ = 989913149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989916157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494956578 + 494956579.

It is an arithmetic number, because the mean of its divisors is an integer number (494956579).

Almost surely, 2^989913157 is an apocalyptic number.

It is an amenable number.

989913157 is a deficient number, since it is larger than the sum of its proper divisors (1).

989913157 is an equidigital number, since it uses as much as digits as its factorization.

989913157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 612360, while the sum is 52.

The square root of 989913157 is about 31462.8853889786. The cubic root of 989913157 is about 996.6263502867.

The spelling of 989913157 in words is "nine hundred eighty-nine million, nine hundred thirteen thousand, one hundred fifty-seven".