9131904421 has 2 divisors, whose sum is σ = 9131904422. Its totient is φ = 9131904420.

The previous prime is 9131904371. The next prime is 9131904437. The reversal of 9131904421 is 1244091319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7693219521 + 1438684900 = 87711^2 + 37930^2 .

It is a cyclic number.

It is not a de Polignac number, because 9131904421 - 2¹⁵ = 9131871653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9131904461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4565952210 + 4565952211.

It is an arithmetic number, because the mean of its divisors is an integer number (4565952211).

Almost surely, 2^9131904421 is an apocalyptic number.

It is an amenable number.

9131904421 is a deficient number, since it is larger than the sum of its proper divisors (1).

9131904421 is an equidigital number, since it uses as much as digits as its factorization.

9131904421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 9131904421 is about 95560.9984303220. The cubic root of 9131904421 is about 2090.1965140342.

The spelling of 9131904421 in words is "nine billion, one hundred thirty-one million, nine hundred four thousand, four hundred twenty-one".