1289893990225 has 9 divisors (see below), whose sum is σ = 1599475589467. Its totient is φ = 1031910649240.

The previous prime is 1289893990211. The next prime is 1289893990279. The reversal of 1289893990225 is 5220993989821.

The square root of 1289893990225 is 1135735.

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., 464361836481 + 825532153744 = 681441^2 + 908588^2 .

It is not a de Polignac number, because 1289893990225 - 2⁷ = 1289893990097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5565102 + ... + 5792248.

Almost surely, 2^{1289893990225} is an apocalyptic number.

1289893990225 is the 1135735-th square number.

1289893990225 is the 567868-th centered octagonal number.

It is an amenable number.

1289893990225 is a deficient number, since it is larger than the sum of its proper divisors (309581599242).

1289893990225 is an frugal number, since it uses more digits than its factorization.

1289893990225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454304 (or 227152 counting only the distinct ones).

The product of its (nonzero) digits is 50388480, while the sum is 67.

The spelling of 1289893990225 in words is "one trillion, two hundred eighty-nine billion, eight hundred ninety-three million, nine hundred ninety thousand, two hundred twenty-five".