16181001 has 12 divisors (see below), whose sum is σ = 23636340. Its totient is φ = 10665600.

The previous prime is 16180979. The next prime is 16181023. The reversal of 16181001 is 10018161.

It is an interprime number because it is at equal distance from previous prime (16180979) and next prime (16181023).

It can be written as a sum of positive squares in 2 ways, for example, as 853776 + 15327225 = 924^2 + 3915^2 .

It is not a de Polignac number, because 16181001 - 2⁷ = 16180873 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16181051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9300 + ... + 10901.

It is an arithmetic number, because the mean of its divisors is an integer number (1969695).

Almost surely, 2^16181001 is an apocalyptic number.

It is an amenable number.

16181001 is a deficient number, since it is larger than the sum of its proper divisors (7455339).

16181001 is a wasteful number, since it uses less digits than its factorization.

16181001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20296 (or 20293 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

The square root of 16181001 is about 4022.5614973546. The cubic root of 16181001 is about 252.9308449878.

Adding to 16181001 its reverse (10018161), we get a palindrome (26199162).

The spelling of 16181001 in words is "sixteen million, one hundred eighty-one thousand, one".