2181363461 has 2 divisors, whose sum is σ = 2181363462. Its totient is φ = 2181363460.

The previous prime is 2181363439. The next prime is 2181363473. The reversal of 2181363461 is 1643631812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1463445025 + 717918436 = 38255^2 + 26794^2 .

It is a cyclic number.

It is not a de Polignac number, because 2181363461 - 2⁶ = 2181363397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2181383461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090681730 + 1090681731.

It is an arithmetic number, because the mean of its divisors is an integer number (1090681731).

Almost surely, 2^2181363461 is an apocalyptic number.

It is an amenable number.

2181363461 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181363461 is an equidigital number, since it uses as much as digits as its factorization.

2181363461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 2181363461 is about 46705.0689004952. The cubic root of 2181363461 is about 1296.9085241373.

The spelling of 2181363461 in words is "two billion, one hundred eighty-one million, three hundred sixty-three thousand, four hundred sixty-one".