40231621361 has 2 divisors, whose sum is σ = 40231621362. Its totient is φ = 40231621360.

The previous prime is 40231621279. The next prime is 40231621363. The reversal of 40231621361 is 16312613204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22355931361 + 17875690000 = 149519^2 + 133700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40231621361 is a prime.

Together with 40231621363, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40231621363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20115810680 + 20115810681.

It is an arithmetic number, because the mean of its divisors is an integer number (20115810681).

Almost surely, 2^40231621361 is an apocalyptic number.

It is an amenable number.

40231621361 is a deficient number, since it is larger than the sum of its proper divisors (1).

40231621361 is an equidigital number, since it uses as much as digits as its factorization.

40231621361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 40231621361 in words is "forty billion, two hundred thirty-one million, six hundred twenty-one thousand, three hundred sixty-one".