121109869 has 2 divisors, whose sum is σ = 121109870. Its totient is φ = 121109868.

The previous prime is 121109851. The next prime is 121109873. The reversal of 121109869 is 968901121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61434244 + 59675625 = 7838^2 + 7725^2 .

It is a cyclic number.

It is not a de Polignac number, because 121109869 - 2⁵ = 121109837 is a prime.

It is a super-2 number, since 2×121109869² = 29335200738394322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121109809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60554934 + 60554935.

It is an arithmetic number, because the mean of its divisors is an integer number (60554935).

Almost surely, 2^121109869 is an apocalyptic number.

It is an amenable number.

121109869 is a deficient number, since it is larger than the sum of its proper divisors (1).

121109869 is an equidigital number, since it uses as much as digits as its factorization.

121109869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 37.

The square root of 121109869 is about 11004.9929123103. The cubic root of 121109869 is about 494.7584019797.

The spelling of 121109869 in words is "one hundred twenty-one million, one hundred nine thousand, eight hundred sixty-nine".