1488861195721 has 9 divisors (see below), whose sum is σ = 1491830942133. Its totient is φ = 1485897356640.

The previous prime is 1488861195691. The next prime is 1488861195743. The reversal of 1488861195721 is 1275911688841.

The square root of 1488861195721 is 1220189.

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

It can be written as a sum of positive squares in 4 ways, for example, as 39100712121 + 1449760483600 = 197739^2 + 1204060^2 .

It is not a de Polignac number, because 1488861195721 - 2²¹ = 1488859098569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1488861195721.

It is not an unprimeable number, because it can be changed into a prime (1488861195421) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 865113141 + ... + 865114861.

Almost surely, 2^{1488861195721} is an apocalyptic number.

1488861195721 is the 1220189-th square number.

1488861195721 is the 610095-th centered octagonal number.

It is an amenable number.

1488861195721 is a deficient number, since it is larger than the sum of its proper divisors (2969746412).

1488861195721 is an frugal number, since it uses more digits than its factorization.

1488861195721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4860 (or 2430 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 61.

The spelling of 1488861195721 in words is "one trillion, four hundred eighty-eight billion, eight hundred sixty-one million, one hundred ninety-five thousand, seven hundred twenty-one".