16531402 has 4 divisors (see below), whose sum is σ = 24797106. Its totient is φ = 8265700.

The previous prime is 16531399. The next prime is 16531433. The reversal of 16531402 is 20413561.

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

It can be written as a sum of positive squares in only one way, i.e., 13535041 + 2996361 = 3679^2 + 1731^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4132849 + ... + 4132852.

Almost surely, 2^16531402 is an apocalyptic number.

16531402 is a deficient number, since it is larger than the sum of its proper divisors (8265704).

16531402 is an equidigital number, since it uses as much as digits as its factorization.

16531402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8265703.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 16531402 is about 4065.8826839937. The cubic root of 16531402 is about 254.7435689496.

Adding to 16531402 its reverse (20413561), we get a palindrome (36944963).

The spelling of 16531402 in words is "sixteen million, five hundred thirty-one thousand, four hundred two".