1989270472225 has 81 divisors (see below), whose sum is σ = 2610226928491. Its totient is φ = 1503840889600.

The previous prime is 1989270472199. The next prime is 1989270472253. The reversal of 1989270472225 is 5222740729891.

The square root of 1989270472225 is 1410415.

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

It can be written as a sum of positive squares in 13 ways, for example, as 1053593443809 + 935677028416 = 1026447^2 + 967304^2 .

It is not a de Polignac number, because 1989270472225 - 2²⁵ = 1989236917793 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 1989270472225.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 14520222357 + ... + 14520222493.

Almost surely, 2^{1989270472225} is an apocalyptic number.

1989270472225 is the 1410415-th square number.

1989270472225 is the 705208-th centered octagonal number.

It is an amenable number.

1989270472225 is a deficient number, since it is larger than the sum of its proper divisors (620956456266).

1989270472225 is an frugal number, since it uses more digits than its factorization.

1989270472225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 58.

The spelling of 1989270472225 in words is "one trillion, nine hundred eighty-nine billion, two hundred seventy million, four hundred seventy-two thousand, two hundred twenty-five".