211190798025 has 27 divisors (see below), whose sum is σ = 378278532021. Its totient is φ = 112631415840.

The previous prime is 211190798017. The next prime is 211190798081. The reversal of 211190798025 is 520897091112.

The square root of 211190798025 is 459555.

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 36058591881 + 175132206144 = 189891^2 + 418488^2 .

It is not a de Polignac number, because 211190798025 - 2³ = 211190798017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 6878007 + ... + 6908643.

Almost surely, 2^211190798025 is an apocalyptic number.

211190798025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

211190798025 is the 459555-th square number.

211190798025 is the 229778-th centered octagonal number.

It is an amenable number.

211190798025 is a deficient number, since it is larger than the sum of its proper divisors (167087733996).

211190798025 is an frugal number, since it uses more digits than its factorization.

211190798025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61290 (or 30645 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 45.

The spelling of 211190798025 in words is "two hundred eleven billion, one hundred ninety million, seven hundred ninety-eight thousand, twenty-five".