16861447 has 2 divisors, whose sum is σ = 16861448. Its totient is φ = 16861446.

The previous prime is 16861387. The next prime is 16861451. The reversal of 16861447 is 74416861.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16861447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16861457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8430723 + 8430724.

It is an arithmetic number, because the mean of its divisors is an integer number (8430724).

Almost surely, 2^16861447 is an apocalyptic number.

16861447 is a deficient number, since it is larger than the sum of its proper divisors (1).

16861447 is an equidigital number, since it uses as much as digits as its factorization.

16861447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 37.

The square root of 16861447 is about 4106.2692313096. The cubic root of 16861447 is about 256.4277060426.

The spelling of 16861447 in words is "sixteen million, eight hundred sixty-one thousand, four hundred forty-seven".