157181243 has 4 divisors (see below), whose sum is σ = 165453960. Its totient is φ = 148908528.

The previous prime is 157181239. The next prime is 157181257. The reversal of 157181243 is 342181751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342181751 = 31 ⋅11038121.

It is a cyclic number.

It is not a de Polignac number, because 157181243 - 2² = 157181239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157181443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4136330 + ... + 4136367.

It is an arithmetic number, because the mean of its divisors is an integer number (41363490).

Almost surely, 2^157181243 is an apocalyptic number.

157181243 is a deficient number, since it is larger than the sum of its proper divisors (8272717).

157181243 is an equidigital number, since it uses as much as digits as its factorization.

157181243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8272716.

The product of its digits is 6720, while the sum is 32.

The square root of 157181243 is about 12537.1943831146. The cubic root of 157181243 is about 539.6765815989.

It can be divided in two parts, 15718 and 1243, that added together give a palindrome (16961).

The spelling of 157181243 in words is "one hundred fifty-seven million, one hundred eighty-one thousand, two hundred forty-three".