157889813 has 2 divisors, whose sum is σ = 157889814. Its totient is φ = 157889812.

The previous prime is 157889803. The next prime is 157889839. The reversal of 157889813 is 318988751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114105124 + 43784689 = 10682^2 + 6617^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157889813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157889803) 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, 78944906 + 78944907.

It is an arithmetic number, because the mean of its divisors is an integer number (78944907).

Almost surely, 2^157889813 is an apocalyptic number.

It is an amenable number.

157889813 is a deficient number, since it is larger than the sum of its proper divisors (1).

157889813 is an equidigital number, since it uses as much as digits as its factorization.

157889813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 50.

The square root of 157889813 is about 12565.4213220250. The cubic root of 157889813 is about 540.4863165853.

The spelling of 157889813 in words is "one hundred fifty-seven million, eight hundred eighty-nine thousand, eight hundred thirteen".