40120513 has 2 divisors, whose sum is σ = 40120514. Its totient is φ = 40120512.

The previous prime is 40120511. The next prime is 40120517. The reversal of 40120513 is 31502104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31494544 + 8625969 = 5612^2 + 2937^2 .

It is a cyclic number.

It is not a de Polignac number, because 40120513 - 2¹ = 40120511 is a prime.

Together with 40120511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40120511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20060256 + 20060257.

It is an arithmetic number, because the mean of its divisors is an integer number (20060257).

Almost surely, 2^40120513 is an apocalyptic number.

It is an amenable number.

40120513 is a deficient number, since it is larger than the sum of its proper divisors (1).

40120513 is an equidigital number, since it uses as much as digits as its factorization.

40120513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 40120513 is about 6334.0755442290. The cubic root of 40120513 is about 342.3383022048.

Adding to 40120513 its reverse (31502104), we get a palindrome (71622617).

The spelling of 40120513 in words is "forty million, one hundred twenty thousand, five hundred thirteen".