1981055450 has 48 divisors (see below), whose sum is σ = 4065007680. Its totient is φ = 712272000.

The previous prime is 1981055437. The next prime is 1981055467. The reversal of 1981055450 is 545501891.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28715 + ... + 69185.

It is an arithmetic number, because the mean of its divisors is an integer number (84687660).

Almost surely, 2^1981055450 is an apocalyptic number.

1981055450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1981055450 is an abundant number, since it is smaller than the sum of its proper divisors (2083952230).

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

1981055450 is a wasteful number, since it uses less digits than its factorization.

1981055450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40583 (or 40578 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 38.

The square root of 1981055450 is about 44509.0490799343. The cubic root of 1981055450 is about 1255.9303165831.

The spelling of 1981055450 in words is "one billion, nine hundred eighty-one million, fifty-five thousand, four hundred fifty".