1613653309 has 4 divisors (see below), whose sum is σ = 1620700060. Its totient is φ = 1606606560.

The previous prime is 1613653291. The next prime is 1613653357. The reversal of 1613653309 is 9033563161.

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 864536409 + 749116900 = 29403^2 + 27370^2 .

It is a cyclic number.

It is not a de Polignac number, because 1613653309 - 2⁹ = 1613652797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1613653609) 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, 3523032 + ... + 3523489.

It is an arithmetic number, because the mean of its divisors is an integer number (405175015).

Almost surely, 2^1613653309 is an apocalyptic number.

It is an amenable number.

1613653309 is a deficient number, since it is larger than the sum of its proper divisors (7046751).

1613653309 is an equidigital number, since it uses as much as digits as its factorization.

1613653309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7046750.

The product of its (nonzero) digits is 43740, while the sum is 37.

The square root of 1613653309 is about 40170.3038201107. The cubic root of 1613653309 is about 1172.9245532702.

The spelling of 1613653309 in words is "one billion, six hundred thirteen million, six hundred fifty-three thousand, three hundred nine".