40551361 has 2 divisors, whose sum is σ = 40551362. Its totient is φ = 40551360.

The previous prime is 40551359. The next prime is 40551431. The reversal of 40551361 is 16315504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40449600 + 101761 = 6360^2 + 319^2 .

It is a cyclic number.

It is not a de Polignac number, because 40551361 - 2¹ = 40551359 is a prime.

Together with 40551359, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40551311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20275680 + 20275681.

It is an arithmetic number, because the mean of its divisors is an integer number (20275681).

Almost surely, 2^40551361 is an apocalyptic number.

It is an amenable number.

40551361 is a deficient number, since it is larger than the sum of its proper divisors (1).

40551361 is an equidigital number, since it uses as much as digits as its factorization.

40551361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 40551361 is about 6367.9950533900. The cubic root of 40551361 is about 343.5593809936.

Adding to 40551361 its reverse (16315504), we get a palindrome (56866865).

The spelling of 40551361 in words is "forty million, five hundred fifty-one thousand, three hundred sixty-one".