915644213449 has 27 divisors (see below), whose sum is σ = 1071683219943. Its totient is φ = 780043863312.

The previous prime is 915644213443. The next prime is 915644213459. The reversal of 915644213449 is 944312446519.

It is a happy number.

The square root of 915644213449 is 956893.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2984983225 + 912659230224 = 54635^2 + 955332^2 .

It is not a de Polignac number, because 915644213449 - 2⁵ = 915644213417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 915644213396 and 915644213405.

It is not an unprimeable number, because it can be changed into a prime (915644213443) 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 26 ways as a sum of consecutive naturals, for example, 1493709667 + ... + 1493710279.

It is an arithmetic number, because the mean of its divisors is an integer number (39691971109).

Almost surely, 2^915644213449 is an apocalyptic number.

915644213449 is the 956893-rd square number.

915644213449 is the 478447-th centered octagonal number.

It is an amenable number.

915644213449 is a deficient number, since it is larger than the sum of its proper divisors (156039006494).

915644213449 is an frugal number, since it uses more digits than its factorization.

915644213449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1686 (or 843 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 52.

The spelling of 915644213449 in words is "nine hundred fifteen billion, six hundred forty-four million, two hundred thirteen thousand, four hundred forty-nine".