9772439021 has 2 divisors, whose sum is σ = 9772439022. Its totient is φ = 9772439020.

The previous prime is 9772438997. The next prime is 9772439057. The reversal of 9772439021 is 1209342779.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7269438121 + 2503000900 = 85261^2 + 50030^2 .

It is an emirp because it is prime and its reverse (1209342779) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9772439021 - 2⁶ = 9772438957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9772439921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4886219510 + 4886219511.

It is an arithmetic number, because the mean of its divisors is an integer number (4886219511).

Almost surely, 2^9772439021 is an apocalyptic number.

It is an amenable number.

9772439021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9772439021 is an equidigital number, since it uses as much as digits as its factorization.

9772439021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 9772439021 is about 98855.6473905259. The cubic root of 9772439021 is about 2137.9669617414.

The spelling of 9772439021 in words is "nine billion, seven hundred seventy-two million, four hundred thirty-nine thousand, twenty-one".