121875869 has 4 divisors (see below), whose sum is σ = 122381820. Its totient is φ = 121369920.

The previous prime is 121875857. The next prime is 121875913. The reversal of 121875869 is 968578121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52736644 + 69139225 = 7262^2 + 8315^2 .

It is a cyclic number.

It is not a de Polignac number, because 121875869 - 2¹⁶ = 121810333 is a prime.

It is a super-2 number, since 2×121875869² = 29707454889010322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121875829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252614 + ... + 253095.

It is an arithmetic number, because the mean of its divisors is an integer number (30595455).

Almost surely, 2^121875869 is an apocalyptic number.

It is an amenable number.

121875869 is a deficient number, since it is larger than the sum of its proper divisors (505951).

121875869 is an equidigital number, since it uses as much as digits as its factorization.

121875869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505950.

The product of its digits is 241920, while the sum is 47.

The square root of 121875869 is about 11039.7404407894. The cubic root of 121875869 is about 495.7992990566.

The spelling of 121875869 in words is "one hundred twenty-one million, eight hundred seventy-five thousand, eight hundred sixty-nine".