1210123531 has 2 divisors, whose sum is σ = 1210123532. Its totient is φ = 1210123530.

The previous prime is 1210123511. The next prime is 1210123543. The reversal of 1210123531 is 1353210121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1210123531 is a prime.

It is a super-2 number, since 2×1210123531² = 2928797920559815922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1210123499 and 1210123508.

It is not a weakly prime, because it can be changed into another prime (1210123511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605061765 + 605061766.

It is an arithmetic number, because the mean of its divisors is an integer number (605061766).

Almost surely, 2^1210123531 is an apocalyptic number.

1210123531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210123531 is an equidigital number, since it uses as much as digits as its factorization.

1210123531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1210123531 is about 34786.8298498153. The cubic root of 1210123531 is about 1065.6384985932.

Adding to 1210123531 its reverse (1353210121), we get a palindrome (2563333652).

The spelling of 1210123531 in words is "one billion, two hundred ten million, one hundred twenty-three thousand, five hundred thirty-one".