231533017691 has 2 divisors, whose sum is σ = 231533017692. Its totient is φ = 231533017690.

The previous prime is 231533017637. The next prime is 231533017711. The reversal of 231533017691 is 196710335132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231533017691 - 2¹⁰ = 231533016667 is a prime.

It is a super-2 number, since 2×231533017691² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231533017621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115766508845 + 115766508846.

It is an arithmetic number, because the mean of its divisors is an integer number (115766508846).

Almost surely, 2^231533017691 is an apocalyptic number.

231533017691 is a deficient number, since it is larger than the sum of its proper divisors (1).

231533017691 is an equidigital number, since it uses as much as digits as its factorization.

231533017691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 41.

The spelling of 231533017691 in words is "two hundred thirty-one billion, five hundred thirty-three million, seventeen thousand, six hundred ninety-one".