161394577 has 4 divisors (see below), whose sum is σ = 161748196. Its totient is φ = 161040960.

The previous prime is 161394557. The next prime is 161394601. The reversal of 161394577 is 775493161.

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 59969536 + 101425041 = 7744^2 + 10071^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161394577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161394547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176124 + ... + 177037.

It is an arithmetic number, because the mean of its divisors is an integer number (40437049).

Almost surely, 2^161394577 is an apocalyptic number.

It is an amenable number.

161394577 is a deficient number, since it is larger than the sum of its proper divisors (353619).

161394577 is an equidigital number, since it uses as much as digits as its factorization.

161394577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353618.

The product of its digits is 158760, while the sum is 43.

The square root of 161394577 is about 12704.1165375637. The cubic root of 161394577 is about 544.4562396337.

The spelling of 161394577 in words is "one hundred sixty-one million, three hundred ninety-four thousand, five hundred seventy-seven".