689322157 has 2 divisors, whose sum is σ = 689322158. Its totient is φ = 689322156.

The previous prime is 689322149. The next prime is 689322229. The reversal of 689322157 is 751223986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 535413321 + 153908836 = 23139^2 + 12406^2 .

It is a cyclic number.

It is not a de Polignac number, because 689322157 - 2³ = 689322149 is a prime.

It is a super-2 number, since 2×689322157² = 950330072262265298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689320157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344661078 + 344661079.

It is an arithmetic number, because the mean of its divisors is an integer number (344661079).

Almost surely, 2^689322157 is an apocalyptic number.

It is an amenable number.

689322157 is a deficient number, since it is larger than the sum of its proper divisors (1).

689322157 is an equidigital number, since it uses as much as digits as its factorization.

689322157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 43.

The square root of 689322157 is about 26254.9453817752. The cubic root of 689322157 is about 883.3661352322.

The spelling of 689322157 in words is "six hundred eighty-nine million, three hundred twenty-two thousand, one hundred fifty-seven".