1616001617 has 4 divisors (see below), whose sum is σ = 1635471600. Its totient is φ = 1596531636.

The previous prime is 1616001581. The next prime is 1616001631. The reversal of 1616001617 is 7161006161.

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: 7161006161 = 43 ⋅166535027.

It is a cyclic number.

It is not a de Polignac number, because 1616001617 - 2²⁶ = 1548892753 is a prime.

It is a super-2 number, since 2×1616001617² = 5222922452293229378, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1616001617.

It is not an unprimeable number, because it can be changed into a prime (1616001817) 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, 9734867 + ... + 9735032.

It is an arithmetic number, because the mean of its divisors is an integer number (408867900).

Almost surely, 2^1616001617 is an apocalyptic number.

It is an amenable number.

1616001617 is a deficient number, since it is larger than the sum of its proper divisors (19469983).

1616001617 is an equidigital number, since it uses as much as digits as its factorization.

1616001617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19469982.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 1616001617 is about 40199.5225966677. The cubic root of 1616001617 is about 1173.4932530947.

Adding to 1616001617 its reverse (7161006161), we get a palindrome (8777007778).

The spelling of 1616001617 in words is "one billion, six hundred sixteen million, one thousand, six hundred seventeen".