1981225352 has 12 divisors (see below), whose sum is σ = 3715033605. Its totient is φ = 990549728.

The previous prime is 1981225349. The next prime is 1981225381. The reversal of 1981225352 is 2535221891.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 1556618116 + 424607236 = 39454^2 + 20606^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=31474.

It is a super-3 number, since 3×1981225352³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 118028 + ... + 133764.

Almost surely, 2^1981225352 is an apocalyptic number.

It is an amenable number.

1981225352 is a deficient number, since it is larger than the sum of its proper divisors (1733808253).

1981225352 is an frugal number, since it uses more digits than its factorization.

1981225352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31480 (or 15739 counting only the distinct ones).

The product of its digits is 43200, while the sum is 38.

The square root of 1981225352 is about 44510.9576621308. The cubic root of 1981225352 is about 1255.9662198307.

The spelling of 1981225352 in words is "one billion, nine hundred eighty-one million, two hundred twenty-five thousand, three hundred fifty-two".