9771520201 has 9 divisors (see below), whose sum is σ = 10019818759. Its totient is φ = 9529236400.

The previous prime is 9771520189. The next prime is 9771520211. The reversal of 9771520201 is 1020251779.

The square root of 9771520201 is 98851.

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., 470846601 + 9300673600 = 21699^2 + 96440^2 .

It is a de Polignac number, because none of the positive numbers 2^k-9771520201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9771520211) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4051686 + ... + 4054096.

Almost surely, 2^9771520201 is an apocalyptic number.

9771520201 is the 98851-st square number.

9771520201 is the 49426-th centered octagonal number.

It is an amenable number.

9771520201 is a deficient number, since it is larger than the sum of its proper divisors (248298558).

9771520201 is an frugal number, since it uses more digits than its factorization.

9771520201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4904 (or 2452 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 34.

The cubic root of 9771520201 is about 2137.8999546422.

The spelling of 9771520201 in words is "nine billion, seven hundred seventy-one million, five hundred twenty thousand, two hundred one".