981901950 has 72 divisors (see below), whose sum is σ = 2570168088. Its totient is φ = 248045760.

The previous prime is 981901939. The next prime is 981901979. The reversal of 981901950 is 59109189.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 45084 + ... + 63216.

It is an arithmetic number, because the mean of its divisors is an integer number (35696779).

Almost surely, 2^981901950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 981901950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1285084044).

981901950 is an abundant number, since it is smaller than the sum of its proper divisors (1588266138).

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

981901950 is a wasteful number, since it uses less digits than its factorization.

981901950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18186 (or 18162 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 42.

The square root of 981901950 is about 31335.3147423159. The cubic root of 981901950 is about 993.9305530090.

The spelling of 981901950 in words is "nine hundred eighty-one million, nine hundred one thousand, nine hundred fifty".