1810990625 has 12 divisors (see below), whose sum is σ = 2263597308. Its totient is φ = 1448790000.

The previous prime is 1810990543. The next prime is 1810990627. The reversal of 1810990625 is 5260990181.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1367298529 + 443692096 = 36977^2 + 21064^2 .

It is not a de Polignac number, because 1810990625 - 2¹⁴ = 1810974241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1810990627) 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, 286634 + ... + 292883.

It is an arithmetic number, because the mean of its divisors is an integer number (188633109).

Almost surely, 2^1810990625 is an apocalyptic number.

It is an amenable number.

1810990625 is a deficient number, since it is larger than the sum of its proper divisors (452606683).

1810990625 is an frugal number, since it uses more digits than its factorization.

1810990625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579542 (or 579522 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 1810990625 is about 42555.7355123842. The cubic root of 1810990625 is about 1218.9111993660.

The spelling of 1810990625 in words is "one billion, eight hundred ten million, nine hundred ninety thousand, six hundred twenty-five".