16699481 has 2 divisors, whose sum is σ = 16699482. Its totient is φ = 16699480.

The previous prime is 16699477. The next prime is 16699531. The reversal of 16699481 is 18499661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14784025 + 1915456 = 3845^2 + 1384^2 .

It is an emirp because it is prime and its reverse (18499661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16699481 - 2² = 16699477 is a prime.

It is a super-2 number, since 2×16699481² = 557745331338722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16699451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8349740 + 8349741.

It is an arithmetic number, because the mean of its divisors is an integer number (8349741).

Almost surely, 2^16699481 is an apocalyptic number.

It is an amenable number.

16699481 is a deficient number, since it is larger than the sum of its proper divisors (1).

16699481 is an equidigital number, since it uses as much as digits as its factorization.

16699481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 44.

The square root of 16699481 is about 4086.4998470574. The cubic root of 16699481 is about 255.6040071194.

The spelling of 16699481 in words is "sixteen million, six hundred ninety-nine thousand, four hundred eighty-one".