5681961 has 16 divisors (see below), whose sum is σ = 8913600. Its totient is φ = 3564864.

The previous prime is 5681947. The next prime is 5681981. The reversal of 5681961 is 1691865.

5681961 is a `hidden beast` number, since 568 + 1 + 96 + 1 = 666.

It is not a de Polignac number, because 5681961 - 2⁹ = 5681449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5681911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5731 + ... + 6648.

It is an arithmetic number, because the mean of its divisors is an integer number (557100).

Almost surely, 2^5681961 is an apocalyptic number.

5681961 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

5681961 is a deficient number, since it is larger than the sum of its proper divisors (3231639).

5681961 is a wasteful number, since it uses less digits than its factorization.

5681961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12405 (or 12399 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 5681961 is about 2383.6864307203. The cubic root of 5681961 is about 178.4429589649.

The spelling of 5681961 in words is "five million, six hundred eighty-one thousand, nine hundred sixty-one".