16181401 has 2 divisors, whose sum is σ = 16181402. Its totient is φ = 16181400.

The previous prime is 16181381. The next prime is 16181413. The reversal of 16181401 is 10418161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16040025 + 141376 = 4005^2 + 376^2 .

It is a cyclic number.

It is not a de Polignac number, because 16181401 - 2⁷ = 16181273 is a prime.

It is not a weakly prime, because it can be changed into another prime (16181471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8090700 + 8090701.

It is an arithmetic number, because the mean of its divisors is an integer number (8090701).

Almost surely, 2^16181401 is an apocalyptic number.

It is an amenable number.

16181401 is a deficient number, since it is larger than the sum of its proper divisors (1).

16181401 is an equidigital number, since it uses as much as digits as its factorization.

16181401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 16181401 is about 4022.6112166104. The cubic root of 16181401 is about 252.9329291503.

Adding to 16181401 its reverse (10418161), we get a palindrome (26599562).

The spelling of 16181401 in words is "sixteen million, one hundred eighty-one thousand, four hundred one".