121591854 has 48 divisors (see below), whose sum is σ = 289297008. Its totient is φ = 38143872.

The previous prime is 121591843. The next prime is 121591859. The reversal of 121591854 is 458195121.

121591854 is a `hidden beast` number, since 12 + 1 + 591 + 8 + 54 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121591859) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 904 + ... + 15620.

It is an arithmetic number, because the mean of its divisors is an integer number (6027021).

Almost surely, 2^121591854 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121591854, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144648504).

121591854 is an abundant number, since it is smaller than the sum of its proper divisors (167705154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121591854 is a wasteful number, since it uses less digits than its factorization.

121591854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14751 (or 14739 counting only the distinct ones).

The product of its digits is 14400, while the sum is 36.

The square root of 121591854 is about 11026.8696373903. The cubic root of 121591854 is about 495.4138687446.

The spelling of 121591854 in words is "one hundred twenty-one million, five hundred ninety-one thousand, eight hundred fifty-four".