1646358913 has 4 divisors (see below), whose sum is σ = 1703129940. Its totient is φ = 1589587888.

The previous prime is 1646358887. The next prime is 1646358983. The reversal of 1646358913 is 3198536461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3198536461 = 1123 ⋅2848207.

It can be written as a sum of positive squares in 2 ways, for example, as 1362200464 + 284158449 = 36908^2 + 16857^2 .

It is a cyclic number.

It is not a de Polignac number, because 1646358913 - 2¹³ = 1646350721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1646358983) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 28385470 + ... + 28385527.

It is an arithmetic number, because the mean of its divisors is an integer number (425782485).

Almost surely, 2^1646358913 is an apocalyptic number.

It is an amenable number.

1646358913 is a deficient number, since it is larger than the sum of its proper divisors (56771027).

1646358913 is an equidigital number, since it uses as much as digits as its factorization.

1646358913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56771026.

The product of its digits is 466560, while the sum is 46.

The square root of 1646358913 is about 40575.3485875353. The cubic root of 1646358913 is about 1180.7959087450.

The spelling of 1646358913 in words is "one billion, six hundred forty-six million, three hundred fifty-eight thousand, nine hundred thirteen".