1994681525 has 12 divisors (see below), whose sum is σ = 2473995300. Its totient is φ = 1595364480.

The previous prime is 1994681489. The next prime is 1994681527. The reversal of 1994681525 is 5251864991.

It can be written as a sum of positive squares in 6 ways, for example, as 107039716 + 1887641809 = 10346^2 + 43447^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1994681525 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1994681527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149321 + ... + 162129.

It is an arithmetic number, because the mean of its divisors is an integer number (206166275).

Almost surely, 2^1994681525 is an apocalyptic number.

It is an amenable number.

1994681525 is a deficient number, since it is larger than the sum of its proper divisors (479313775).

1994681525 is a wasteful number, since it uses less digits than its factorization.

1994681525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19048 (or 19043 counting only the distinct ones).

The product of its digits is 777600, while the sum is 50.

The square root of 1994681525 is about 44661.8576080306. The cubic root of 1994681525 is about 1258.8032487080.

The spelling of 1994681525 in words is "one billion, nine hundred ninety-four million, six hundred eighty-one thousand, five hundred twenty-five".