157781189 has 2 divisors, whose sum is σ = 157781190. Its totient is φ = 157781188.

The previous prime is 157781179. The next prime is 157781207. The reversal of 157781189 is 981187751.

157781189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93508900 + 64272289 = 9670^2 + 8017^2 .

It is a cyclic number.

It is not a de Polignac number, because 157781189 - 2¹⁶ = 157715653 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157781179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78890594 + 78890595.

It is an arithmetic number, because the mean of its divisors is an integer number (78890595).

Almost surely, 2^157781189 is an apocalyptic number.

It is an amenable number.

157781189 is a deficient number, since it is larger than the sum of its proper divisors (1).

157781189 is an equidigital number, since it uses as much as digits as its factorization.

157781189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 47.

The square root of 157781189 is about 12561.0982402018. The cubic root of 157781189 is about 540.3623414044.

The spelling of 157781189 in words is "one hundred fifty-seven million, seven hundred eighty-one thousand, one hundred eighty-nine".