1605172249 has 8 divisors (see below), whose sum is σ = 1702853280. Its totient is φ = 1507853376.

The previous prime is 1605172237. The next prime is 1605172271. The reversal of 1605172249 is 9422715061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1605172249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1605172229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81379 + ... + 99160.

It is an arithmetic number, because the mean of its divisors is an integer number (212856660).

Almost surely, 2^1605172249 is an apocalyptic number.

It is an amenable number.

1605172249 is a deficient number, since it is larger than the sum of its proper divisors (97681031).

1605172249 is a wasteful number, since it uses less digits than its factorization.

1605172249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181079.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 1605172249 is about 40064.6009464714. The cubic root of 1605172249 is about 1170.8660519855.

The spelling of 1605172249 in words is "one billion, six hundred five million, one hundred seventy-two thousand, two hundred forty-nine".