22131647561 has 2 divisors, whose sum is σ = 22131647562. Its totient is φ = 22131647560.

The previous prime is 22131647519. The next prime is 22131647599. The reversal of 22131647561 is 16574613122.

It is an a-pointer prime, because the next prime (22131647599) can be obtained adding 22131647561 to its sum of digits (38).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12713915536 + 9417732025 = 112756^2 + 97045^2 .

It is a cyclic number.

It is not a de Polignac number, because 22131647561 - 2⁶ = 22131647497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (22131641561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11065823780 + 11065823781.

It is an arithmetic number, because the mean of its divisors is an integer number (11065823781).

Almost surely, 2^22131647561 is an apocalyptic number.

It is an amenable number.

22131647561 is a deficient number, since it is larger than the sum of its proper divisors (1).

22131647561 is an equidigital number, since it uses as much as digits as its factorization.

22131647561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The spelling of 22131647561 in words is "twenty-two billion, one hundred thirty-one million, six hundred forty-seven thousand, five hundred sixty-one".