1616409409 has 4 divisors (see below), whose sum is σ = 1668551680. Its totient is φ = 1564267140.

The previous prime is 1616409397. The next prime is 1616409437. The reversal of 1616409409 is 9049046161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9049046161 = 17 ⋅532296833.

It is a cyclic number.

It is not a de Polignac number, because 1616409409 - 2¹⁷ = 1616278337 is a prime.

It is a super-2 number, since 2×1616409409² = 5225558755007458562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1616409469) 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, 26071089 + ... + 26071150.

It is an arithmetic number, because the mean of its divisors is an integer number (417137920).

Almost surely, 2^1616409409 is an apocalyptic number.

It is an amenable number.

1616409409 is a deficient number, since it is larger than the sum of its proper divisors (52142271).

1616409409 is an equidigital number, since it uses as much as digits as its factorization.

1616409409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52142270.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 1616409409 is about 40204.5943767625. The cubic root of 1616409409 is about 1173.5919536795.

The spelling of 1616409409 in words is "one billion, six hundred sixteen million, four hundred nine thousand, four hundred nine".