161724477 has 8 divisors (see below), whose sum is σ = 225008064. Its totient is φ = 103128608.

The previous prime is 161724469. The next prime is 161724517. The reversal of 161724477 is 774427161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161724477 - 2³ = 161724469 is a prime.

It is a super-4 number, since 4×161724477⁴ (a number of 34 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161724457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1171848 + ... + 1171985.

It is an arithmetic number, because the mean of its divisors is an integer number (28126008).

Almost surely, 2^161724477 is an apocalyptic number.

It is an amenable number.

161724477 is a deficient number, since it is larger than the sum of its proper divisors (63283587).

161724477 is a wasteful number, since it uses less digits than its factorization.

161724477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2343859.

The product of its digits is 65856, while the sum is 39.

The square root of 161724477 is about 12717.0938897218. The cubic root of 161724477 is about 544.8269540109.

The spelling of 161724477 in words is "one hundred sixty-one million, seven hundred twenty-four thousand, four hundred seventy-seven".