1613993449 has 4 divisors (see below), whose sum is σ = 1640452420. Its totient is φ = 1587534480.

The previous prime is 1613993443. The next prime is 1613993473. The reversal of 1613993449 is 9443993161.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 152078224 + 1461915225 = 12332^2 + 38235^2 .

It is a cyclic number.

It is not a de Polignac number, because 1613993449 - 2¹³ = 1613985257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1613993443) 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, 13229394 + ... + 13229515.

It is an arithmetic number, because the mean of its divisors is an integer number (410113105).

Almost surely, 2^1613993449 is an apocalyptic number.

It is an amenable number.

1613993449 is a deficient number, since it is larger than the sum of its proper divisors (26458971).

1613993449 is an equidigital number, since it uses as much as digits as its factorization.

1613993449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26458970.

The product of its digits is 629856, while the sum is 49.

The square root of 1613993449 is about 40174.5373215424. The cubic root of 1613993449 is about 1173.0069605892.

The spelling of 1613993449 in words is "one billion, six hundred thirteen million, nine hundred ninety-three thousand, four hundred forty-nine".