15994481 has 4 divisors (see below), whose sum is σ = 16510464. Its totient is φ = 15478500.

The previous prime is 15994477. The next prime is 15994483. The reversal of 15994481 is 18449951.

15994481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15994481 - 2² = 15994477 is a prime.

It is a super-2 number, since 2×15994481² = 511646844918722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15994483) 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, 257945 + ... + 258006.

It is an arithmetic number, because the mean of its divisors is an integer number (4127616).

Almost surely, 2^15994481 is an apocalyptic number.

It is an amenable number.

15994481 is a deficient number, since it is larger than the sum of its proper divisors (515983).

15994481 is an equidigital number, since it uses as much as digits as its factorization.

15994481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515982.

The product of its digits is 51840, while the sum is 41.

The square root of 15994481 is about 3999.3100654988. The cubic root of 15994481 is about 251.9552337126.

The spelling of 15994481 in words is "fifteen million, nine hundred ninety-four thousand, four hundred eighty-one".