161217677 has 4 divisors (see below), whose sum is σ = 163950240. Its totient is φ = 158485116.

The previous prime is 161217659. The next prime is 161217691. The reversal of 161217677 is 776712161.

It is a happy number.

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: 776712161 = 31 ⋅25055231.

It is a cyclic number.

It is not a de Polignac number, because 161217677 - 2¹⁸ = 160955533 is a prime.

It is a super-3 number, since 3×161217677³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161217677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161217607) 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, 1366193 + ... + 1366310.

It is an arithmetic number, because the mean of its divisors is an integer number (40987560).

Almost surely, 2^161217677 is an apocalyptic number.

It is an amenable number.

161217677 is a deficient number, since it is larger than the sum of its proper divisors (2732563).

161217677 is an equidigital number, since it uses as much as digits as its factorization.

161217677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2732562.

The product of its digits is 24696, while the sum is 38.

The square root of 161217677 is about 12697.1523185319. The cubic root of 161217677 is about 544.2572459187.

The spelling of 161217677 in words is "one hundred sixty-one million, two hundred seventeen thousand, six hundred seventy-seven".