16401145 has 4 divisors (see below), whose sum is σ = 19681380. Its totient is φ = 13120912.

The previous prime is 16401137. The next prime is 16401149. The reversal of 16401145 is 54110461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10265616 + 6135529 = 3204^2 + 2477^2 .

It is a cyclic number.

It is not a de Polignac number, because 16401145 - 2³ = 16401137 is a prime.

It is a super-2 number, since 2×16401145² = 537995114622050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16401149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1640110 + ... + 1640119.

It is an arithmetic number, because the mean of its divisors is an integer number (4920345).

Almost surely, 2^16401145 is an apocalyptic number.

It is an amenable number.

16401145 is a deficient number, since it is larger than the sum of its proper divisors (3280235).

16401145 is an equidigital number, since it uses as much as digits as its factorization.

16401145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3280234.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 16401145 is about 4049.8327125944. The cubic root of 16401145 is about 254.0727311508.

The spelling of 16401145 in words is "sixteen million, four hundred one thousand, one hundred forty-five".