161226647 has 4 divisors (see below), whose sum is σ = 169712280. Its totient is φ = 152741016.

The previous prime is 161226641. The next prime is 161226671. The reversal of 161226647 is 746622161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161226647 - 2²⁶ = 94117783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161226641) 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, 4242788 + ... + 4242825.

It is an arithmetic number, because the mean of its divisors is an integer number (42428070).

Almost surely, 2^161226647 is an apocalyptic number.

161226647 is a deficient number, since it is larger than the sum of its proper divisors (8485633).

161226647 is an equidigital number, since it uses as much as digits as its factorization.

161226647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8485632.

The product of its digits is 24192, while the sum is 35.

The square root of 161226647 is about 12697.5055424284. The cubic root of 161226647 is about 544.2673397187.

The spelling of 161226647 in words is "one hundred sixty-one million, two hundred twenty-six thousand, six hundred forty-seven".