9129531997 has 2 divisors, whose sum is σ = 9129531998. Its totient is φ = 9129531996.

The previous prime is 9129531949. The next prime is 9129532001. The reversal of 9129531997 is 7991359219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5106674521 + 4022857476 = 71461^2 + 63426^2 .

It is a cyclic number.

It is not a de Polignac number, because 9129531997 - 2¹⁹ = 9129007709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9129531937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4564765998 + 4564765999.

It is an arithmetic number, because the mean of its divisors is an integer number (4564765999).

Almost surely, 2^9129531997 is an apocalyptic number.

It is an amenable number.

9129531997 is a deficient number, since it is larger than the sum of its proper divisors (1).

9129531997 is an equidigital number, since it uses as much as digits as its factorization.

9129531997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1377810, while the sum is 55.

The square root of 9129531997 is about 95548.5844845438. The cubic root of 9129531997 is about 2090.0154907546.

The spelling of 9129531997 in words is "nine billion, one hundred twenty-nine million, five hundred thirty-one thousand, nine hundred ninety-seven".