161717377 has 4 divisors (see below), whose sum is σ = 161796096. Its totient is φ = 161638660.

The previous prime is 161717357. The next prime is 161717383. The reversal of 161717377 is 773717161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161717377 - 2¹¹ = 161715329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161717317) 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, 36193 + ... + 40414.

It is an arithmetic number, because the mean of its divisors is an integer number (40449024).

Almost surely, 2^161717377 is an apocalyptic number.

It is an amenable number.

161717377 is a deficient number, since it is larger than the sum of its proper divisors (78719).

161717377 is an equidigital number, since it uses as much as digits as its factorization.

161717377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78718.

The product of its digits is 43218, while the sum is 40.

The square root of 161717377 is about 12716.8147348304. The cubic root of 161717377 is about 544.8189809280.

The spelling of 161717377 in words is "one hundred sixty-one million, seven hundred seventeen thousand, three hundred seventy-seven".