9999997537 has 2 divisors, whose sum is σ = 9999997538. Its totient is φ = 9999997536.

The previous prime is 9999997519. The next prime is 9999997543. The reversal of 9999997537 is 7357999999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9692205601 + 307791936 = 98449^2 + 17544^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999997537 - 2⁷ = 9999997409 is a prime.

It is not a weakly prime, because it can be changed into another prime (9999997237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999998768 + 4999998769.

It is an arithmetic number, because the mean of its divisors is an integer number (4999998769).

Almost surely, 2^9999997537 is an apocalyptic number.

It is an amenable number.

9999997537 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999997537 is an equidigital number, since it uses as much as digits as its factorization.

9999997537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 390609135, while the sum is 76.

The square root of 9999997537 is about 99999.9876849992. The cubic root of 9999997537 is about 2154.4345131528.

The spelling of 9999997537 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-seven thousand, five hundred thirty-seven".