121870187 has 8 divisors (see below), whose sum is σ = 122796000. Its totient is φ = 120947904.

The previous prime is 121870159. The next prime is 121870211. The reversal of 121870187 is 781078121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121870187 - 2¹⁴ = 121853803 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121870117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150239 + ... + 151047.

It is an arithmetic number, because the mean of its divisors is an integer number (15349500).

Almost surely, 2^121870187 is an apocalyptic number.

121870187 is a deficient number, since it is larger than the sum of its proper divisors (925813).

121870187 is an equidigital number, since it uses as much as digits as its factorization.

121870187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1765.

The product of its (nonzero) digits is 6272, while the sum is 35.

The square root of 121870187 is about 11039.4830947830. The cubic root of 121870187 is about 495.7915940165.

The spelling of 121870187 in words is "one hundred twenty-one million, eight hundred seventy thousand, one hundred eighty-seven".