16261001 has 2 divisors, whose sum is σ = 16261002. Its totient is φ = 16261000.

The previous prime is 16260997. The next prime is 16261073. The reversal of 16261001 is 10016261.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11526025 + 4734976 = 3395^2 + 2176^2 .

It is a cyclic number.

It is not a de Polignac number, because 16261001 - 2² = 16260997 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16261801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8130500 + 8130501.

It is an arithmetic number, because the mean of its divisors is an integer number (8130501).

Almost surely, 2^16261001 is an apocalyptic number.

It is an amenable number.

16261001 is a deficient number, since it is larger than the sum of its proper divisors (1).

16261001 is an equidigital number, since it uses as much as digits as its factorization.

16261001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 16261001 is about 4032.4931494052. The cubic root of 16261001 is about 253.3469958390.

Adding to 16261001 its reverse (10016261), we get a palindrome (26277262).

The spelling of 16261001 in words is "sixteen million, two hundred sixty-one thousand, one".