1681420425 has 12 divisors (see below), whose sum is σ = 2779948560. Its totient is φ = 896757520.

The previous prime is 1681420423. The next prime is 1681420457. The reversal of 1681420425 is 5240241861.

It is a happy number.

It is not a de Polignac number, because 1681420425 - 2¹ = 1681420423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1681420421) 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, 11209395 + ... + 11209544.

It is an arithmetic number, because the mean of its divisors is an integer number (231662380).

Almost surely, 2^1681420425 is an apocalyptic number.

1681420425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1681420425 is a deficient number, since it is larger than the sum of its proper divisors (1098528135).

1681420425 is a wasteful number, since it uses less digits than its factorization.

1681420425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22418952 (or 22418947 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 1681420425 is about 41005.1268136071. The cubic root of 1681420425 is about 1189.1193317031.

The spelling of 1681420425 in words is "one billion, six hundred eighty-one million, four hundred twenty thousand, four hundred twenty-five".