16531990 has 32 divisors (see below), whose sum is σ = 32534784. Its totient is φ = 6021120.

The previous prime is 16531987. The next prime is 16532003. The reversal of 16531990 is 9913561.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3702 + ... + 6838.

It is an arithmetic number, because the mean of its divisors is an integer number (1016712).

Almost surely, 2^16531990 is an apocalyptic number.

16531990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16531990 is a deficient number, since it is larger than the sum of its proper divisors (16002794).

16531990 is a wasteful number, since it uses less digits than its factorization.

16531990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3192.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 16531990 is about 4065.9549923726. The cubic root of 16531990 is about 254.7465892105.

The spelling of 16531990 in words is "sixteen million, five hundred thirty-one thousand, nine hundred ninety".