985551012291 has 4 divisors (see below), whose sum is σ = 1314068016392. Its totient is φ = 657034008192.

The previous prime is 985551012287. The next prime is 985551012293. The reversal of 985551012291 is 192210155589.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192210155589 = 3 ⋅64070051863.

It is not a de Polignac number, because 985551012291 - 2² = 985551012287 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 985551012291.

It is not an unprimeable number, because it can be changed into a prime (985551012293) 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, 164258502046 + ... + 164258502051.

It is an arithmetic number, because the mean of its divisors is an integer number (328517004098).

Almost surely, 2^985551012291 is an apocalyptic number.

985551012291 is a deficient number, since it is larger than the sum of its proper divisors (328517004101).

985551012291 is a wasteful number, since it uses less digits than its factorization.

985551012291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328517004100.

The product of its (nonzero) digits is 324000, while the sum is 48.

The spelling of 985551012291 in words is "nine hundred eighty-five billion, five hundred fifty-one million, twelve thousand, two hundred ninety-one".