2101992530625 has 135 divisors (see below), whose sum is σ = 4111114493343. Its totient is φ = 1034131176000.

The previous prime is 2101992530569. The next prime is 2101992530629. The reversal of 2101992530625 is 5260352991012.

The square root of 2101992530625 is 1449825.

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

2101992530625 is a `hidden beast` number, since 2 + 1 + 0 + 1 + 9 + 92 + 530 + 6 + 25 = 666.

It can be written as a sum of positive squares in 7 ways, for example, as 2076201455409 + 25791075216 = 1440903^2 + 160596^2 .

It is not a de Polignac number, because 2101992530625 - 2¹³ = 2101992522433 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (2101992530629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 1413578632 + ... + 1413580118.

Almost surely, 2^{2101992530625} is an apocalyptic number.

2101992530625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2101992530625 is the 1449825-th square number.

2101992530625 is the 724913-rd centered octagonal number.

It is an amenable number.

2101992530625 is a deficient number, since it is larger than the sum of its proper divisors (2009121962718).

2101992530625 is an frugal number, since it uses more digits than its factorization.

2101992530625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3026 (or 1508 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The spelling of 2101992530625 in words is "two trillion, one hundred one billion, nine hundred ninety-two million, five hundred thirty thousand, six hundred twenty-five".