161307775 has 6 divisors (see below), whose sum is σ = 200021672. Its totient is φ = 129046200.

The previous prime is 161307721. The next prime is 161307791. The reversal of 161307775 is 577703161.

It is a happy number.

It is not a de Polignac number, because 161307775 - 2⁷ = 161307647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3226131 + ... + 3226180.

Almost surely, 2^161307775 is an apocalyptic number.

161307775 is a deficient number, since it is larger than the sum of its proper divisors (38713897).

161307775 is an equidigital number, since it uses as much as digits as its factorization.

161307775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6452321 (or 6452316 counting only the distinct ones).

The product of its (nonzero) digits is 30870, while the sum is 37.

The square root of 161307775 is about 12700.6997838702. The cubic root of 161307775 is about 544.3586147807.

The spelling of 161307775 in words is "one hundred sixty-one million, three hundred seven thousand, seven hundred seventy-five".