15649481 has 4 divisors (see below), whose sum is σ = 15715200. Its totient is φ = 15583764.

The previous prime is 15649477. The next prime is 15649519. The reversal of 15649481 is 18494651.

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 15649481 - 2² = 15649477 is a prime.

It is a super-2 number, since 2×15649481² = 489812511138722, 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 (15649421) 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, 32501 + ... + 32978.

It is an arithmetic number, because the mean of its divisors is an integer number (3928800).

Almost surely, 2^15649481 is an apocalyptic number.

It is an amenable number.

15649481 is a deficient number, since it is larger than the sum of its proper divisors (65719).

15649481 is an equidigital number, since it uses as much as digits as its factorization.

15649481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65718.

The product of its digits is 34560, while the sum is 38.

The square root of 15649481 is about 3955.9424919986. The cubic root of 15649481 is about 250.1304972034.

The spelling of 15649481 in words is "fifteen million, six hundred forty-nine thousand, four hundred eighty-one".