9490880821 has 2 divisors, whose sum is σ = 9490880822. Its totient is φ = 9490880820.

The previous prime is 9490880813. The next prime is 9490880831. The reversal of 9490880821 is 1280880949.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5352531921 + 4138348900 = 73161^2 + 64330^2 .

It is a cyclic number.

It is not a de Polignac number, because 9490880821 - 2³ = 9490880813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9490880831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4745440410 + 4745440411.

It is an arithmetic number, because the mean of its divisors is an integer number (4745440411).

Almost surely, 2^9490880821 is an apocalyptic number.

It is an amenable number.

9490880821 is a deficient number, since it is larger than the sum of its proper divisors (1).

9490880821 is an equidigital number, since it uses as much as digits as its factorization.

9490880821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331776, while the sum is 49.

The square root of 9490880821 is about 97421.1518151987. The cubic root of 9490880821 is about 2117.2339044139.

The spelling of 9490880821 in words is "nine billion, four hundred ninety million, eight hundred eighty thousand, eight hundred twenty-one".