157730819 has 2 divisors, whose sum is σ = 157730820. Its totient is φ = 157730818.

The previous prime is 157730779. The next prime is 157730843. The reversal of 157730819 is 918037751.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 157730819 - 2²⁰ = 156682243 is a prime.

It is a super-2 number, since 2×157730819² = 49758022524821522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (157730869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78865409 + 78865410.

It is an arithmetic number, because the mean of its divisors is an integer number (78865410).

Almost surely, 2^157730819 is an apocalyptic number.

157730819 is a deficient number, since it is larger than the sum of its proper divisors (1).

157730819 is an equidigital number, since it uses as much as digits as its factorization.

157730819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 41.

The square root of 157730819 is about 12559.0930803144. The cubic root of 157730819 is about 540.3048336026.

The spelling of 157730819 in words is "one hundred fifty-seven million, seven hundred thirty thousand, eight hundred nineteen".