1681907461 has 48 divisors (see below), whose sum is σ = 2042409600. Its totient is φ = 1374170112.

The previous prime is 1681907443. The next prime is 1681907467. The reversal of 1681907461 is 1647091861.

It is not a de Polignac number, because 1681907461 - 2⁷ = 1681907333 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681907467) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4684800 + ... + 4685158.

It is an arithmetic number, because the mean of its divisors is an integer number (42550200).

Almost surely, 2^1681907461 is an apocalyptic number.

It is an amenable number.

1681907461 is a deficient number, since it is larger than the sum of its proper divisors (360502139).

1681907461 is a wasteful number, since it uses less digits than its factorization.

1681907461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 1681907461 is about 41011.0651044325. The cubic root of 1681907461 is about 1189.2341330551.

The spelling of 1681907461 in words is "one billion, six hundred eighty-one million, nine hundred seven thousand, four hundred sixty-one".