1081999854 has 72 divisors (see below), whose sum is σ = 2547737712. Its totient is φ = 331718400.

The previous prime is 1081999837. The next prime is 1081999873. The reversal of 1081999854 is 4589991801.

It is a self number, because there is not a number n which added to its sum of digits gives 1081999854.

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, 1219399 + ... + 1220285.

It is an arithmetic number, because the mean of its divisors is an integer number (35385246).

Almost surely, 2^1081999854 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1081999854, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1273868856).

1081999854 is an abundant number, since it is smaller than the sum of its proper divisors (1465737858).

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

1081999854 is a wasteful number, since it uses less digits than its factorization.

1081999854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322 (or 1306 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 54.

The square root of 1081999854 is about 32893.7661875316. The cubic root of 1081999854 is about 1026.6184557157.

The spelling of 1081999854 in words is "one billion, eighty-one million, nine hundred ninety-nine thousand, eight hundred fifty-four".