161118457 has 2 divisors, whose sum is σ = 161118458. Its totient is φ = 161118456.

The previous prime is 161118431. The next prime is 161118481. The reversal of 161118457 is 754811161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156150016 + 4968441 = 12496^2 + 2229^2 .

It is a cyclic number.

It is not a de Polignac number, because 161118457 - 2⁷ = 161118329 is a prime.

It is not a weakly prime, because it can be changed into another prime (161118497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80559228 + 80559229.

It is an arithmetic number, because the mean of its divisors is an integer number (80559229).

Almost surely, 2^161118457 is an apocalyptic number.

It is an amenable number.

161118457 is a deficient number, since it is larger than the sum of its proper divisors (1).

161118457 is an equidigital number, since it uses as much as digits as its factorization.

161118457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 34.

The square root of 161118457 is about 12693.2445418813. The cubic root of 161118457 is about 544.1455702288.

The spelling of 161118457 in words is "one hundred sixty-one million, one hundred eighteen thousand, four hundred fifty-seven".