16505494 has 4 divisors (see below), whose sum is σ = 24758244. Its totient is φ = 8252746.

The previous prime is 16505491. The next prime is 16505501. The reversal of 16505494 is 49450561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49450561 = 137 ⋅360953.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16505491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4126372 + ... + 4126375.

It is an arithmetic number, because the mean of its divisors is an integer number (6189561).

Almost surely, 2^16505494 is an apocalyptic number.

16505494 is a deficient number, since it is larger than the sum of its proper divisors (8252750).

16505494 is an equidigital number, since it uses as much as digits as its factorization.

16505494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8252749.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 16505494 is about 4062.6954106849. The cubic root of 16505494 is about 254.6104213966.

The spelling of 16505494 in words is "sixteen million, five hundred five thousand, four hundred ninety-four".