157026689 has 2 divisors, whose sum is σ = 157026690. Its totient is φ = 157026688.

The previous prime is 157026647. The next prime is 157026691. The reversal of 157026689 is 986620751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130142464 + 26884225 = 11408^2 + 5185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157026689 is a prime.

It is a Sophie Germain prime.

Together with 157026691, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (157026629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78513344 + 78513345.

It is an arithmetic number, because the mean of its divisors is an integer number (78513345).

Almost surely, 2^157026689 is an apocalyptic number.

It is an amenable number.

157026689 is a deficient number, since it is larger than the sum of its proper divisors (1).

157026689 is an equidigital number, since it uses as much as digits as its factorization.

157026689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 157026689 is about 12531.0290479274. The cubic root of 157026689 is about 539.4996382476.

The spelling of 157026689 in words is "one hundred fifty-seven million, twenty-six thousand, six hundred eighty-nine".