181157897 has 2 divisors, whose sum is σ = 181157898. Its totient is φ = 181157896.

The previous prime is 181157863. The next prime is 181157917. The reversal of 181157897 is 798751181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151683856 + 29474041 = 12316^2 + 5429^2 .

It is a cyclic number.

It is not a de Polignac number, because 181157897 - 2⁶ = 181157833 is a prime.

It is not a weakly prime, because it can be changed into another prime (181157857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90578948 + 90578949.

It is an arithmetic number, because the mean of its divisors is an integer number (90578949).

Almost surely, 2^181157897 is an apocalyptic number.

It is an amenable number.

181157897 is a deficient number, since it is larger than the sum of its proper divisors (1).

181157897 is an equidigital number, since it uses as much as digits as its factorization.

181157897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 47.

The square root of 181157897 is about 13459.4909636286. The cubic root of 181157897 is about 565.8297225300.

The spelling of 181157897 in words is "one hundred eighty-one million, one hundred fifty-seven thousand, eight hundred ninety-seven".