161617893 has 4 divisors (see below), whose sum is σ = 215490528. Its totient is φ = 107745260.

The previous prime is 161617891. The next prime is 161617901. The reversal of 161617893 is 398716161.

161617893 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 398716161 = 3 ⋅132905387.

It is a cyclic number.

It is not a de Polignac number, because 161617893 - 2¹ = 161617891 is a prime.

It is a super-2 number, since 2×161617893² = 52240686675518898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161617891) 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, 26936313 + ... + 26936318.

It is an arithmetic number, because the mean of its divisors is an integer number (53872632).

Almost surely, 2^161617893 is an apocalyptic number.

It is an amenable number.

161617893 is a deficient number, since it is larger than the sum of its proper divisors (53872635).

161617893 is an equidigital number, since it uses as much as digits as its factorization.

161617893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53872634.

The product of its digits is 54432, while the sum is 42.

The square root of 161617893 is about 12712.9026189930. The cubic root of 161617893 is about 544.7072388865.

The spelling of 161617893 in words is "one hundred sixty-one million, six hundred seventeen thousand, eight hundred ninety-three".