121881599 has 32 divisors (see below), whose sum is σ = 151656960. Its totient is φ = 95644800.

The previous prime is 121881581. The next prime is 121881629. The reversal of 121881599 is 995188121.

It is a Cunningham number, because it is equal to 11040²-1.

It is a cyclic number.

It is not a de Polignac number, because 121881599 - 2¹⁶ = 121816063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121881569) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 673289 + ... + 673469.

It is an arithmetic number, because the mean of its divisors is an integer number (4739280).

Almost surely, 2^121881599 is an apocalyptic number.

121881599 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

121881599 is a deficient number, since it is larger than the sum of its proper divisors (29775361).

121881599 is a wasteful number, since it uses less digits than its factorization.

121881599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351.

The product of its digits is 51840, while the sum is 44.

The square root of 121881599 is about 11039.9999547101. Note that the first 4 decimals coincide. The cubic root of 121881599 is about 495.8070689444.

The spelling of 121881599 in words is "one hundred twenty-one million, eight hundred eighty-one thousand, five hundred ninety-nine".