121988611 has 4 divisors (see below), whose sum is σ = 122293224. Its totient is φ = 121684000.

The previous prime is 121988597. The next prime is 121988623. The reversal of 121988611 is 116889121.

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

It is a cyclic number.

It is not a de Polignac number, because 121988611 - 2⁷ = 121988483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121988411) 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, 151705 + ... + 152506.

It is an arithmetic number, because the mean of its divisors is an integer number (30573306).

Almost surely, 2^121988611 is an apocalyptic number.

121988611 is a deficient number, since it is larger than the sum of its proper divisors (304613).

121988611 is an equidigital number, since it uses as much as digits as its factorization.

121988611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304612.

The product of its digits is 6912, while the sum is 37.

The square root of 121988611 is about 11044.8454493488. The cubic root of 121988611 is about 495.9521326400.

The spelling of 121988611 in words is "one hundred twenty-one million, nine hundred eighty-eight thousand, six hundred eleven".