178997641 has 9 divisors (see below), whose sum is σ = 190388199. Its totient is φ = 168254304.

The previous prime is 178997639. The next prime is 178997653. The reversal of 178997641 is 146799871.

The square root of 178997641 is 13379.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 139358025 + 39639616 = 11805^2 + 6296^2 .

It is not a de Polignac number, because 178997641 - 2¹ = 178997639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (178997141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 227050 + ... + 227836.

Almost surely, 2^178997641 is an apocalyptic number.

178997641 is the 13379-th square number.

178997641 is the 6690-th centered octagonal number.

It is an amenable number.

178997641 is a deficient number, since it is larger than the sum of its proper divisors (11390558).

178997641 is an frugal number, since it uses more digits than its factorization.

178997641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1608 (or 804 counting only the distinct ones).

The product of its digits is 762048, while the sum is 52.

The cubic root of 178997641 is about 563.5716037056.

The spelling of 178997641 in words is "one hundred seventy-eight million, nine hundred ninety-seven thousand, six hundred forty-one".