99997523 has 2 divisors, whose sum is σ = 99997524. Its totient is φ = 99997522.

The previous prime is 99997511. The next prime is 99997531. The reversal of 99997523 is 32579999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99997523 - 2⁶ = 99997459 is a prime.

It is a super-2 number, since 2×99997523² = 19999009212271058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (99997543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49998761 + 49998762.

It is an arithmetic number, because the mean of its divisors is an integer number (49998762).

Almost surely, 2^99997523 is an apocalyptic number.

99997523 is a deficient number, since it is larger than the sum of its proper divisors (1).

99997523 is an equidigital number, since it uses as much as digits as its factorization.

99997523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1377810, while the sum is 53.

The square root of 99997523 is about 9999.8761492330. The cubic root of 99997523 is about 464.1550509245.

The spelling of 99997523 in words is "ninety-nine million, nine hundred ninety-seven thousand, five hundred twenty-three".