121631598 has 64 divisors (see below), whose sum is σ = 298045440. Its totient is φ = 36460800.

The previous prime is 121631581. The next prime is 121631633. The reversal of 121631598 is 895136121.

121631598 is a `hidden beast` number, since 1 + 2 + 1 + 63 + 1 + 598 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56563 + ... + 58673.

It is an arithmetic number, because the mean of its divisors is an integer number (4656960).

Almost surely, 2^121631598 is an apocalyptic number.

121631598 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121631598, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149022720).

121631598 is an abundant number, since it is smaller than the sum of its proper divisors (176413842).

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

121631598 is a wasteful number, since it uses less digits than its factorization.

121631598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230 (or 2224 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 121631598 is about 11028.6716335196. The cubic root of 121631598 is about 495.4678405178.

The spelling of 121631598 in words is "one hundred twenty-one million, six hundred thirty-one thousand, five hundred ninety-eight".