161654949 has 12 divisors (see below), whose sum is σ = 238470336. Its totient is φ = 105476712.

The previous prime is 161654947. The next prime is 161654959. The reversal of 161654949 is 949456161.

It is a happy number.

161654949 is a `hidden beast` number, since 1 + 61 + 6 + 549 + 49 = 666.

It is not a de Polignac number, because 161654949 - 2¹ = 161654947 is a prime.

It is a super-2 number, since 2×161654949² = 52264645072385202, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161654947) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 190659 + ... + 191504.

It is an arithmetic number, because the mean of its divisors is an integer number (19872528).

Almost surely, 2^161654949 is an apocalyptic number.

It is an amenable number.

161654949 is a deficient number, since it is larger than the sum of its proper divisors (76815387).

161654949 is a wasteful number, since it uses less digits than its factorization.

161654949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382216 (or 382213 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 161654949 is about 12714.3599524317. The cubic root of 161654949 is about 544.7488661440.

It can be divided in two parts, 1616 and 54949, that added together give a palindrome (56565).

The spelling of 161654949 in words is "one hundred sixty-one million, six hundred fifty-four thousand, nine hundred forty-nine".