16502401 has 2 divisors, whose sum is σ = 16502402. Its totient is φ = 16502400.

The previous prime is 16502383. The next prime is 16502441. The reversal of 16502401 is 10420561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10857025 + 5645376 = 3295^2 + 2376^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16502401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16502441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8251200 + 8251201.

It is an arithmetic number, because the mean of its divisors is an integer number (8251201).

Almost surely, 2^16502401 is an apocalyptic number.

It is an amenable number.

16502401 is a deficient number, since it is larger than the sum of its proper divisors (1).

16502401 is an equidigital number, since it uses as much as digits as its factorization.

16502401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 16502401 is about 4062.3147342371. The cubic root of 16502401 is about 254.5945164050.

Adding to 16502401 its reverse (10420561), we get a palindrome (26922962).

The spelling of 16502401 in words is "sixteen million, five hundred two thousand, four hundred one".