1981516425 has 48 divisors (see below), whose sum is σ = 3752236032. Its totient is φ = 903873600.

The previous prime is 1981516417. The next prime is 1981516451. The reversal of 1981516425 is 5246151891.

It is not a de Polignac number, because 1981516425 - 2³ = 1981516417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 253932 + ... + 261618.

It is an arithmetic number, because the mean of its divisors is an integer number (78171584).

Almost surely, 2^1981516425 is an apocalyptic number.

1981516425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1981516425 is a deficient number, since it is larger than the sum of its proper divisors (1770719607).

1981516425 is a wasteful number, since it uses less digits than its factorization.

1981516425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8198 (or 8193 counting only the distinct ones).

The product of its digits is 86400, while the sum is 42.

The square root of 1981516425 is about 44514.2272200698. The cubic root of 1981516425 is about 1256.0277238478.

The spelling of 1981516425 in words is "one billion, nine hundred eighty-one million, five hundred sixteen thousand, four hundred twenty-five".