1681153825 has 24 divisors (see below), whose sum is σ = 2248368248. Its totient is φ = 1239598080.

The previous prime is 1681153813. The next prime is 1681153829. The reversal of 1681153825 is 5283511861.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 1547536 + 1679606289 = 1244^2 + 40983^2 .

It is not a de Polignac number, because 1681153825 - 2¹³ = 1681145633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1681153829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 234697 + ... + 241753.

Almost surely, 2^1681153825 is an apocalyptic number.

It is an amenable number.

1681153825 is a deficient number, since it is larger than the sum of its proper divisors (567214423).

1681153825 is a wasteful number, since it uses less digits than its factorization.

1681153825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7813 (or 7808 counting only the distinct ones).

The product of its digits is 57600, while the sum is 40.

The square root of 1681153825 is about 41001.8758717208. The cubic root of 1681153825 is about 1189.0564808805.

The spelling of 1681153825 in words is "one billion, six hundred eighty-one million, one hundred fifty-three thousand, eight hundred twenty-five".