121291969 has 2 divisors, whose sum is σ = 121291970. Its totient is φ = 121291968.

The previous prime is 121291897. The next prime is 121291979. The reversal of 121291969 is 969192121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81450625 + 39841344 = 9025^2 + 6312^2 .

It is a cyclic number.

It is not a de Polignac number, because 121291969 - 2¹¹ = 121289921 is a prime.

It is a super-2 number, since 2×121291969² = 29423483487793922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121291979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60645984 + 60645985.

It is an arithmetic number, because the mean of its divisors is an integer number (60645985).

Almost surely, 2^121291969 is an apocalyptic number.

It is an amenable number.

121291969 is a deficient number, since it is larger than the sum of its proper divisors (1).

121291969 is an equidigital number, since it uses as much as digits as its factorization.

121291969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 40.

The square root of 121291969 is about 11013.2633220131. The cubic root of 121291969 is about 495.0062496235.

The spelling of 121291969 in words is "one hundred twenty-one million, two hundred ninety-one thousand, nine hundred sixty-nine".