16531401 has 16 divisors (see below), whose sum is σ = 22924800. Its totient is φ = 10584960.

The previous prime is 16531399. The next prime is 16531433. The reversal of 16531401 is 10413561.

It is not a de Polignac number, because 16531401 - 2¹ = 16531399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16531201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13261 + ... + 14453.

It is an arithmetic number, because the mean of its divisors is an integer number (1432800).

Almost surely, 2^16531401 is an apocalyptic number.

It is an amenable number.

16531401 is a deficient number, since it is larger than the sum of its proper divisors (6393399).

16531401 is a wasteful number, since it uses less digits than its factorization.

16531401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 16531401 is about 4065.8825610192. The cubic root of 16531401 is about 254.7435638131.

Adding to 16531401 its reverse (10413561), we get a palindrome (26944962).

The spelling of 16531401 in words is "sixteen million, five hundred thirty-one thousand, four hundred one".