157781243 has 8 divisors (see below), whose sum is σ = 161916720. Its totient is φ = 153659520.

The previous prime is 157781213. The next prime is 157781279. The reversal of 157781243 is 342187751.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 157781243 - 2⁶ = 157781179 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 157781197 and 157781206.

It is not an unprimeable number, because it can be changed into a prime (157781213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22271 + ... + 28487.

It is an arithmetic number, because the mean of its divisors is an integer number (20239590).

Almost surely, 2^157781243 is an apocalyptic number.

157781243 is a deficient number, since it is larger than the sum of its proper divisors (4135477).

157781243 is an equidigital number, since it uses as much as digits as its factorization.

157781243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6877.

The product of its digits is 47040, while the sum is 38.

The square root of 157781243 is about 12561.1003896952. The cubic root of 157781243 is about 540.3624030500.

The spelling of 157781243 in words is "one hundred fifty-seven million, seven hundred eighty-one thousand, two hundred forty-three".