180989653 has 4 divisors (see below), whose sum is σ = 194911948. Its totient is φ = 167067360.

The previous prime is 180989651. The next prime is 180989663. The reversal of 180989653 is 356989081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 356989081 = 19 ⋅18788899.

It can be written as a sum of positive squares in 2 ways, for example, as 115412049 + 65577604 = 10743^2 + 8098^2 .

It is a cyclic number.

It is not a de Polignac number, because 180989653 - 2¹ = 180989651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 180989597 and 180989606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180989651) 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, 6961128 + ... + 6961153.

It is an arithmetic number, because the mean of its divisors is an integer number (48727987).

Almost surely, 2^180989653 is an apocalyptic number.

180989653 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

180989653 is a deficient number, since it is larger than the sum of its proper divisors (13922295).

180989653 is a wasteful number, since it uses less digits than its factorization.

180989653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13922294.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 180989653 is about 13453.2394983513. The cubic root of 180989653 is about 565.6545034843.

The spelling of 180989653 in words is "one hundred eighty million, nine hundred eighty-nine thousand, six hundred fifty-three".