1617238849 has 4 divisors (see below), whose sum is σ = 1712370564. Its totient is φ = 1522107136.

The previous prime is 1617238823. The next prime is 1617238871. The reversal of 1617238849 is 9488327161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9488327161 = 113 ⋅83967497.

It can be written as a sum of positive squares in 2 ways, for example, as 479391025 + 1137847824 = 21895^2 + 33732^2 .

It is a cyclic number.

It is not a de Polignac number, because 1617238849 - 2⁵ = 1617238817 is a prime.

It is a super-2 number, since 2×1617238849² = 5230922989429689602, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1617232849) 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, 47565832 + ... + 47565865.

It is an arithmetic number, because the mean of its divisors is an integer number (428092641).

Almost surely, 2^1617238849 is an apocalyptic number.

It is an amenable number.

1617238849 is a deficient number, since it is larger than the sum of its proper divisors (95131715).

1617238849 is an equidigital number, since it uses as much as digits as its factorization.

1617238849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95131714.

The product of its digits is 580608, while the sum is 49.

The square root of 1617238849 is about 40214.9082928210. The cubic root of 1617238849 is about 1173.7926572991.

The spelling of 1617238849 in words is "one billion, six hundred seventeen million, two hundred thirty-eight thousand, eight hundred forty-nine".