161388797 has 4 divisors (see below), whose sum is σ = 161451420. Its totient is φ = 161326176.

The previous prime is 161388791. The next prime is 161388811. The reversal of 161388797 is 797883161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34916281 + 126472516 = 5909^2 + 11246^2 .

It is a cyclic number.

It is not a de Polignac number, because 161388797 - 2⁴ = 161388781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161388791) 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, 27272 + ... + 32657.

It is an arithmetic number, because the mean of its divisors is an integer number (40362855).

Almost surely, 2^161388797 is an apocalyptic number.

It is an amenable number.

161388797 is a deficient number, since it is larger than the sum of its proper divisors (62623).

161388797 is an equidigital number, since it uses as much as digits as its factorization.

161388797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62622.

The product of its digits is 508032, while the sum is 50.

The square root of 161388797 is about 12703.8890502082. The cubic root of 161388797 is about 544.4497400460.

The spelling of 161388797 in words is "one hundred sixty-one million, three hundred eighty-eight thousand, seven hundred ninety-seven".