361721653489 has 27 divisors (see below), whose sum is σ = 424329058251. Its totient is φ = 307452549600.

The previous prime is 361721653481. The next prime is 361721653493. The reversal of 361721653489 is 984356127163.

It is a happy number.

The square root of 361721653489 is 601433.

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., 59617523889 + 302104129600 = 244167^2 + 549640^2 .

It is not a de Polignac number, because 361721653489 - 2³ = 361721653481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (361721653481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 635714397 + ... + 635714965.

Almost surely, 2^361721653489 is an apocalyptic number.

361721653489 is the 601433-rd square number.

361721653489 is the 300717-th centered octagonal number.

It is an amenable number.

361721653489 is a deficient number, since it is larger than the sum of its proper divisors (62607404762).

361721653489 is an frugal number, since it uses more digits than its factorization.

361721653489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454 (or 727 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 55.

The spelling of 361721653489 in words is "three hundred sixty-one billion, seven hundred twenty-one million, six hundred fifty-three thousand, four hundred eighty-nine".