1649659747 has 4 divisors (see below), whose sum is σ = 1651911040. Its totient is φ = 1647408456.

The previous prime is 1649659741. The next prime is 1649659757. The reversal of 1649659747 is 7479569461.

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

It is a cyclic number.

It is not a de Polignac number, because 1649659747 - 2²³ = 1641271139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1649659691 and 1649659700.

It is not an unprimeable number, because it can be changed into a prime (1649659741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1124547 + ... + 1126012.

It is an arithmetic number, because the mean of its divisors is an integer number (412977760).

Almost surely, 2^1649659747 is an apocalyptic number.

1649659747 is a deficient number, since it is larger than the sum of its proper divisors (2251293).

1649659747 is an equidigital number, since it uses as much as digits as its factorization.

1649659747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2251292.

The product of its digits is 11430720, while the sum is 58.

The square root of 1649659747 is about 40616.0035823319. The cubic root of 1649659747 is about 1181.5845195671.

The spelling of 1649659747 in words is "one billion, six hundred forty-nine million, six hundred fifty-nine thousand, seven hundred forty-seven".