161182457 has 4 divisors (see below), whose sum is σ = 170663796. Its totient is φ = 151701120.

The previous prime is 161182421. The next prime is 161182477. The reversal of 161182457 is 754281161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 754281161 = 9371 ⋅80491.

It can be written as a sum of positive squares in 2 ways, for example, as 50069776 + 111112681 = 7076^2 + 10541^2 .

It is a cyclic number.

It is not a de Polignac number, because 161182457 - 2¹² = 161178361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161182477) 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 3 ways as a sum of consecutive naturals, for example, 4740644 + ... + 4740677.

It is an arithmetic number, because the mean of its divisors is an integer number (42665949).

Almost surely, 2^161182457 is an apocalyptic number.

161182457 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

161182457 is a deficient number, since it is larger than the sum of its proper divisors (9481339).

161182457 is an equidigital number, since it uses as much as digits as its factorization.

161182457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9481338.

The product of its digits is 13440, while the sum is 35.

The square root of 161182457 is about 12695.7653176167. The cubic root of 161182457 is about 544.2176097849.

The spelling of 161182457 in words is "one hundred sixty-one million, one hundred eighty-two thousand, four hundred fifty-seven".