9015697421 has 2 divisors, whose sum is σ = 9015697422. Its totient is φ = 9015697420.

The previous prime is 9015697387. The next prime is 9015697433. The reversal of 9015697421 is 1247965109.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7036693225 + 1979004196 = 83885^2 + 44486^2 .

It is a cyclic number.

It is not a de Polignac number, because 9015697421 - 2¹⁰ = 9015696397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9015697721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4507848710 + 4507848711.

It is an arithmetic number, because the mean of its divisors is an integer number (4507848711).

Almost surely, 2^9015697421 is an apocalyptic number.

It is an amenable number.

9015697421 is a deficient number, since it is larger than the sum of its proper divisors (1).

9015697421 is an equidigital number, since it uses as much as digits as its factorization.

9015697421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 9015697421 is about 94951.0264346837. The cubic root of 9015697421 is about 2081.2924521805.

The spelling of 9015697421 in words is "nine billion, fifteen million, six hundred ninety-seven thousand, four hundred twenty-one".