121531899 has 8 divisors (see below), whose sum is σ = 162502992. Its totient is φ = 80791040.

The previous prime is 121531867. The next prime is 121531901. The reversal of 121531899 is 998135121.

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 121531899 - 2⁵ = 121531867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121531499) 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, 56322 + ... + 58439.

It is an arithmetic number, because the mean of its divisors is an integer number (20312874).

Almost surely, 2^121531899 is an apocalyptic number.

121531899 is a deficient number, since it is larger than the sum of its proper divisors (40971093).

121531899 is a wasteful number, since it uses less digits than its factorization.

121531899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115117.

The product of its digits is 19440, while the sum is 39.

The square root of 121531899 is about 11024.1507155880. The cubic root of 121531899 is about 495.3324284704.

The spelling of 121531899 in words is "one hundred twenty-one million, five hundred thirty-one thousand, eight hundred ninety-nine".