121430861 has 2 divisors, whose sum is σ = 121430862. Its totient is φ = 121430860.

The previous prime is 121430857. The next prime is 121430863. The reversal of 121430861 is 168034121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98208100 + 23222761 = 9910^2 + 4819^2 .

It is an emirp because it is prime and its reverse (168034121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121430861 - 2² = 121430857 is a prime.

It is a super-3 number, since 3×121430861³ (a number of 25 digits) contains 333 as substring.

Together with 121430863, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121430861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121430863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60715430 + 60715431.

It is an arithmetic number, because the mean of its divisors is an integer number (60715431).

Almost surely, 2^121430861 is an apocalyptic number.

It is an amenable number.

121430861 is a deficient number, since it is larger than the sum of its proper divisors (1).

121430861 is an equidigital number, since it uses as much as digits as its factorization.

121430861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 121430861 is about 11019.5671875079. The cubic root of 121430861 is about 495.1951222047.

Adding to 121430861 its reverse (168034121), we get a palindrome (289464982).

The spelling of 121430861 in words is "one hundred twenty-one million, four hundred thirty thousand, eight hundred sixty-one".