157783121 has 2 divisors, whose sum is σ = 157783122. Its totient is φ = 157783120.

The previous prime is 157783117. The next prime is 157783139. The reversal of 157783121 is 121387751.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133171600 + 24611521 = 11540^2 + 4961^2 .

It is a cyclic number.

It is not a de Polignac number, because 157783121 - 2² = 157783117 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (157783111) 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, 78891560 + 78891561.

It is an arithmetic number, because the mean of its divisors is an integer number (78891561).

Almost surely, 2^157783121 is an apocalyptic number.

It is an amenable number.

157783121 is a deficient number, since it is larger than the sum of its proper divisors (1).

157783121 is an equidigital number, since it uses as much as digits as its factorization.

157783121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 35.

The square root of 157783121 is about 12561.1751440699. The cubic root of 157783121 is about 540.3645469393.

The spelling of 157783121 in words is "one hundred fifty-seven million, seven hundred eighty-three thousand, one hundred twenty-one".