9781012201 has 3 divisors (see below), whose sum is σ = 9781111101. Its totient is φ = 9780913302.

The previous prime is 9781012181. The next prime is 9781012229. The reversal of 9781012201 is 1022101879.

The square root of 9781012201 is 98899.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1022101879 = 2081 ⋅491159.

It is not a de Polignac number, because 9781012201 - 2⁹ = 9781011689 is a prime.

It is a super-2 number, since 2×9781012201² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9781012231) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 49450 + ... + 148348.

It is an arithmetic number, because the mean of its divisors is an integer number (3260370367).

Almost surely, 2^9781012201 is an apocalyptic number.

9781012201 is the 98899-th square number.

9781012201 is the 49450-th centered octagonal number.

It is an amenable number.

9781012201 is a deficient number, since it is larger than the sum of its proper divisors (98900).

9781012201 is an frugal number, since it uses more digits than its factorization.

9781012201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197798 (or 98899 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 31.

The cubic root of 9781012201 is about 2138.5919786289.

It can be divided in two parts, 97810 and 12201, that added together give a palindrome (110011).

The spelling of 9781012201 in words is "nine billion, seven hundred eighty-one million, twelve thousand, two hundred one".