157755509 has 2 divisors, whose sum is σ = 157755510. Its totient is φ = 157755508.

The previous prime is 157755469. The next prime is 157755511. The reversal of 157755509 is 905557751.

It is a happy number.

157755509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157502500 + 253009 = 12550^2 + 503^2 .

It is a cyclic number.

It is not a de Polignac number, because 157755509 - 2⁸ = 157755253 is a prime.

Together with 157755511, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 157755509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157755709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78877754 + 78877755.

It is an arithmetic number, because the mean of its divisors is an integer number (78877755).

Almost surely, 2^157755509 is an apocalyptic number.

It is an amenable number.

157755509 is a deficient number, since it is larger than the sum of its proper divisors (1).

157755509 is an equidigital number, since it uses as much as digits as its factorization.

157755509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 275625, while the sum is 44.

The square root of 157755509 is about 12560.0759949930. The cubic root of 157755509 is about 540.3330238879. Note that the first 3 decimals are identical.

The spelling of 157755509 in words is "one hundred fifty-seven million, seven hundred fifty-five thousand, five hundred nine".