1649243125 has 20 divisors (see below), whose sum is σ = 2067072700. Its totient is φ = 1315440000.

The previous prime is 1649243119. The next prime is 1649243147. The reversal of 1649243125 is 5213429461.

It is a happy number.

It can be written as a sum of positive squares in 10 ways, for example, as 1290102724 + 359140401 = 35918^2 + 18951^2 .

It is not a de Polignac number, because 1649243125 - 2¹⁵ = 1649210357 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 214345 + ... + 221905.

It is an arithmetic number, because the mean of its divisors is an integer number (103353635).

Almost surely, 2^1649243125 is an apocalyptic number.

It is an amenable number.

1649243125 is a deficient number, since it is larger than the sum of its proper divisors (417829575).

1649243125 is an frugal number, since it uses more digits than its factorization.

1649243125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7930 (or 7915 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The square root of 1649243125 is about 40610.8744673148. The cubic root of 1649243125 is about 1181.4850413659.

The spelling of 1649243125 in words is "one billion, six hundred forty-nine million, two hundred forty-three thousand, one hundred twenty-five".