1098591025 has 27 divisors (see below), whose sum is σ = 1586336619. Its totient is φ = 752524080.

The previous prime is 1098591007. The next prime is 1098591031. The reversal of 1098591025 is 5201958901.

The square root of 1098591025 is 33145.

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., 395492769 + 703098256 = 19887^2 + 26516^2 .

It is not a de Polignac number, because 1098591025 - 2²⁵ = 1065036593 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1159602 + ... + 1160548.

Almost surely, 2^1098591025 is an apocalyptic number.

1098591025 is the 33145-th square number.

1098591025 is the 16573-rd centered octagonal number.

It is an amenable number.

1098591025 is a deficient number, since it is larger than the sum of its proper divisors (487745594).

1098591025 is an frugal number, since it uses more digits than its factorization.

1098591025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918 (or 959 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 40.

The cubic root of 1098591025 is about 1031.8391826334.

Multiplying 1098591025 by its product of nonzero digits (32400), we get a square (35594349210000 = 5966100²).

The spelling of 1098591025 in words is "one billion, ninety-eight million, five hundred ninety-one thousand, twenty-five".