121595998 has 4 divisors (see below), whose sum is σ = 182394000. Its totient is φ = 60797998.

The previous prime is 121595993. The next prime is 121596001. The reversal of 121595998 is 899595121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 899595121 = 61 ⋅14747461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121595993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30398998 + ... + 30399001.

It is an arithmetic number, because the mean of its divisors is an integer number (45598500).

Almost surely, 2^121595998 is an apocalyptic number.

121595998 is a deficient number, since it is larger than the sum of its proper divisors (60798002).

121595998 is an equidigital number, since it uses as much as digits as its factorization.

121595998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60798001.

The product of its digits is 291600, while the sum is 49.

The square root of 121595998 is about 11027.0575404321. The cubic root of 121595998 is about 495.4194967854.

The spelling of 121595998 in words is "one hundred twenty-one million, five hundred ninety-five thousand, nine hundred ninety-eight".