231099497 has 2 divisors, whose sum is σ = 231099498. Its totient is φ = 231099496.

The previous prime is 231099467. The next prime is 231099499. The reversal of 231099497 is 794990132.

231099497 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216207616 + 14891881 = 14704^2 + 3859^2 .

It is a cyclic number.

It is not a de Polignac number, because 231099497 - 2⁶ = 231099433 is a prime.

Together with 231099499, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_12699737 and since 231099497 and 12699737 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (231099499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115549748 + 115549749.

It is an arithmetic number, because the mean of its divisors is an integer number (115549749).

Almost surely, 2^231099497 is an apocalyptic number.

It is an amenable number.

231099497 is a deficient number, since it is larger than the sum of its proper divisors (1).

231099497 is an equidigital number, since it uses as much as digits as its factorization.

231099497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 231099497 is about 15201.9570121745. The cubic root of 231099497 is about 613.6673255405.

The spelling of 231099497 in words is "two hundred thirty-one million, ninety-nine thousand, four hundred ninety-seven".