1612816749 has 6 divisors (see below), whose sum is σ = 2329624206. Its totient is φ = 1075211160.

The previous prime is 1612816747. The next prime is 1612816753. The reversal of 1612816749 is 9476182161.

It can be written as a sum of positive squares in only one way, i.e., 1302704649 + 310112100 = 36093^2 + 17610^2 .

It is not a de Polignac number, because 1612816749 - 2¹ = 1612816747 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1612816747) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 89600922 + ... + 89600939.

It is an arithmetic number, because the mean of its divisors is an integer number (388270701).

Almost surely, 2^1612816749 is an apocalyptic number.

It is an amenable number.

1612816749 is a deficient number, since it is larger than the sum of its proper divisors (716807457).

1612816749 is a wasteful number, since it uses less digits than its factorization.

1612816749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179201867 (or 179201864 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 1612816749 is about 40159.8898031357. The cubic root of 1612816749 is about 1172.7218266640.

The spelling of 1612816749 in words is "one billion, six hundred twelve million, eight hundred sixteen thousand, seven hundred forty-nine".