16961681 has 8 divisors (see below), whose sum is σ = 19100928. Its totient is φ = 14922000.

The previous prime is 16961677. The next prime is 16961729. The reversal of 16961681 is 18616961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16961681 - 2² = 16961677 is a prime.

It is a super-2 number, since 2×16961681² = 575397244691522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16961611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24530 + ... + 25211.

It is an arithmetic number, because the mean of its divisors is an integer number (2387616).

Almost surely, 2^16961681 is an apocalyptic number.

16961681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16961681 is a deficient number, since it is larger than the sum of its proper divisors (2139247).

16961681 is a wasteful number, since it uses less digits than its factorization.

16961681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49783.

The product of its digits is 15552, while the sum is 38.

The square root of 16961681 is about 4118.4561427797. The cubic root of 16961681 is about 256.9348197283.

The spelling of 16961681 in words is "sixteen million, nine hundred sixty-one thousand, six hundred eighty-one".