1616081689 has 4 divisors (see below), whose sum is σ = 1701138640. Its totient is φ = 1531024740.

The previous prime is 1616081627. The next prime is 1616081713. The reversal of 1616081689 is 9861806161.

It is a happy number.

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: 9861806161 = 47 ⋅209825663.

It is a cyclic number.

It is not a de Polignac number, because 1616081689 - 2¹³ = 1616073497 is a prime.

It is a super-2 number, since 2×1616081689² = 5223440051042185442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1616081609) 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, 42528447 + ... + 42528484.

It is an arithmetic number, because the mean of its divisors is an integer number (425284660).

Almost surely, 2^1616081689 is an apocalyptic number.

1616081689 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1616081689 is a deficient number, since it is larger than the sum of its proper divisors (85056951).

1616081689 is an equidigital number, since it uses as much as digits as its factorization.

1616081689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85056950.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 1616081689 is about 40200.5185165565. The cubic root of 1616081689 is about 1173.5126347585.

The spelling of 1616081689 in words is "one billion, six hundred sixteen million, eighty-one thousand, six hundred eighty-nine".