231871610651 has 2 divisors, whose sum is σ = 231871610652. Its totient is φ = 231871610650.

The previous prime is 231871610603. The next prime is 231871610681. The reversal of 231871610651 is 156016178132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231871610651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231871610599 and 231871610608.

It is not a weakly prime, because it can be changed into another prime (231871610681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115935805325 + 115935805326.

It is an arithmetic number, because the mean of its divisors is an integer number (115935805326).

Almost surely, 2^231871610651 is an apocalyptic number.

231871610651 is a deficient number, since it is larger than the sum of its proper divisors (1).

231871610651 is an equidigital number, since it uses as much as digits as its factorization.

231871610651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 41.

Adding to 231871610651 its reverse (156016178132), we get a palindrome (387887788783).

The spelling of 231871610651 in words is "two hundred thirty-one billion, eight hundred seventy-one million, six hundred ten thousand, six hundred fifty-one".