16406501 has 2 divisors, whose sum is σ = 16406502. Its totient is φ = 16406500.

The previous prime is 16406497. The next prime is 16406563. The reversal of 16406501 is 10560461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16394401 + 12100 = 4049^2 + 110^2 .

It is an emirp because it is prime and its reverse (10560461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16406501 - 2² = 16406497 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16406591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8203250 + 8203251.

It is an arithmetic number, because the mean of its divisors is an integer number (8203251).

Almost surely, 2^16406501 is an apocalyptic number.

It is an amenable number.

16406501 is a deficient number, since it is larger than the sum of its proper divisors (1).

16406501 is an equidigital number, since it uses as much as digits as its factorization.

16406501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 16406501 is about 4050.4939204991. The cubic root of 16406501 is about 254.1003850218.

Adding to 16406501 its reverse (10560461), we get a palindrome (26966962).

The spelling of 16406501 in words is "sixteen million, four hundred six thousand, five hundred one".