972181647401 has 4 divisors (see below), whose sum is σ = 972574768212. Its totient is φ = 971788526592.

The previous prime is 972181647397. The next prime is 972181647431. The reversal of 972181647401 is 104746181279.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 104746181279 = 53 ⋅1976343043.

It can be written as a sum of positive squares in 2 ways, for example, as 672670627225 + 299511020176 = 820165^2 + 547276^2 .

It is a cyclic number.

It is not a de Polignac number, because 972181647401 - 2² = 972181647397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 972181647401.

It is not an unprimeable number, because it can be changed into a prime (972181647431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196556696 + ... + 196561641.

It is an arithmetic number, because the mean of its divisors is an integer number (243143692053).

Almost surely, 2^972181647401 is an apocalyptic number.

It is an amenable number.

972181647401 is a deficient number, since it is larger than the sum of its proper divisors (393120811).

972181647401 is a wasteful number, since it uses less digits than its factorization.

972181647401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393120810.

The product of its (nonzero) digits is 677376, while the sum is 50.

The spelling of 972181647401 in words is "nine hundred seventy-two billion, one hundred eighty-one million, six hundred forty-seven thousand, four hundred one".