121887289 has 4 divisors (see below), whose sum is σ = 122284624. Its totient is φ = 121489956.

The previous prime is 121887277. The next prime is 121887341. The reversal of 121887289 is 982788121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 982788121 = 7 ⋅140398303.

It is a cyclic number.

It is not a de Polignac number, because 121887289 - 2⁹ = 121886777 is a prime.

It is a super-2 number, since 2×121887289² = 29713022439539042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121887209) 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, 198207 + ... + 198820.

It is an arithmetic number, because the mean of its divisors is an integer number (30571156).

Almost surely, 2^121887289 is an apocalyptic number.

It is an amenable number.

121887289 is a deficient number, since it is larger than the sum of its proper divisors (397335).

121887289 is an equidigital number, since it uses as much as digits as its factorization.

121887289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397334.

The product of its digits is 129024, while the sum is 46.

The square root of 121887289 is about 11040.2576509790. The cubic root of 121887289 is about 495.8147843511.

The spelling of 121887289 in words is "one hundred twenty-one million, eight hundred eighty-seven thousand, two hundred eighty-nine".