121887619 has 4 divisors (see below), whose sum is σ = 139300144. Its totient is φ = 104475096.

The previous prime is 121887607. The next prime is 121887631. The reversal of 121887619 is 916788121.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (121887607) and next prime (121887631).

It is a cyclic number.

It is not a de Polignac number, because 121887619 - 2¹¹ = 121885571 is a prime.

It is a super-2 number, since 2×121887619² = 29713183330978322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121887019) 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, 8706252 + ... + 8706265.

It is an arithmetic number, because the mean of its divisors is an integer number (34825036).

Almost surely, 2^121887619 is an apocalyptic number.

121887619 is a deficient number, since it is larger than the sum of its proper divisors (17412525).

121887619 is an equidigital number, since it uses as much as digits as its factorization.

121887619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17412524.

The product of its digits is 48384, while the sum is 43.

The square root of 121887619 is about 11040.2725962722. The cubic root of 121887619 is about 495.8152318102.

The spelling of 121887619 in words is "one hundred twenty-one million, eight hundred eighty-seven thousand, six hundred nineteen".