2191625611396 has 81 divisors (see below), whose sum is σ = 4203483134319. Its totient is φ = 999386039808.

The previous prime is 2191625611381. The next prime is 2191625611411. The reversal of 2191625611396 is 6931165261912.

The square root of 2191625611396 is 1480414.

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

It is an interprime number because it is at equal distance from previous prime (2191625611381) and next prime (2191625611411).

It can be written as a sum of positive squares in 4 ways, for example, as 400418121796 + 1791207489600 = 632786^2 + 1338360^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3733603815 + ... + 3733604401.

Almost surely, 2^{2191625611396} is an apocalyptic number.

2191625611396 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2191625611396 is the 1480414-th square number.

It is an amenable number.

2191625611396 is a deficient number, since it is larger than the sum of its proper divisors (2011857522923).

2191625611396 is an frugal number, since it uses more digits than its factorization.

2191625611396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398 (or 699 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 52.

The spelling of 2191625611396 in words is "two trillion, one hundred ninety-one billion, six hundred twenty-five million, six hundred eleven thousand, three hundred ninety-six".