121312861 has 2 divisors, whose sum is σ = 121312862. Its totient is φ = 121312860.

The previous prime is 121312811. The next prime is 121312871. The reversal of 121312861 is 168213121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96412761 + 24900100 = 9819^2 + 4990^2 .

It is a cyclic number.

It is not a de Polignac number, because 121312861 - 2⁷ = 121312733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121312811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60656430 + 60656431.

It is an arithmetic number, because the mean of its divisors is an integer number (60656431).

Almost surely, 2^121312861 is an apocalyptic number.

It is an amenable number.

121312861 is a deficient number, since it is larger than the sum of its proper divisors (1).

121312861 is an equidigital number, since it uses as much as digits as its factorization.

121312861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 25.

The square root of 121312861 is about 11014.2117738856. The cubic root of 121312861 is about 495.0346688638.

Adding to 121312861 its reverse (168213121), we get a palindrome (289525982).

The spelling of 121312861 in words is "one hundred twenty-one million, three hundred twelve thousand, eight hundred sixty-one".