1981509222 has 64 divisors (see below), whose sum is σ = 5231568384. Its totient is φ = 484400640.

The previous prime is 1981509217. The next prime is 1981509253. The reversal of 1981509222 is 2229051891.

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, 118293 + ... + 134000.

It is an arithmetic number, because the mean of its divisors is an integer number (81743256).

Almost surely, 2^1981509222 is an apocalyptic number.

1981509222 is an abundant number, since it is smaller than the sum of its proper divisors (3250059162).

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

1981509222 is a wasteful number, since it uses less digits than its factorization.

1981509222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252333.

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 1981509222 is about 44514.1463132789. The cubic root of 1981509222 is about 1256.0262019193.

The spelling of 1981509222 in words is "one billion, nine hundred eighty-one million, five hundred nine thousand, two hundred twenty-two".