40015031561 has 2 divisors, whose sum is σ = 40015031562. Its totient is φ = 40015031560.

The previous prime is 40015031521. The next prime is 40015031593. The reversal of 40015031561 is 16513051004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39102689536 + 912342025 = 197744^2 + 30205^2 .

It is a cyclic number.

It is not a de Polignac number, because 40015031561 - 2¹⁰ = 40015030537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40015031561.

It is not a weakly prime, because it can be changed into another prime (40015031521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20007515780 + 20007515781.

It is an arithmetic number, because the mean of its divisors is an integer number (20007515781).

Almost surely, 2^40015031561 is an apocalyptic number.

It is an amenable number.

40015031561 is a deficient number, since it is larger than the sum of its proper divisors (1).

40015031561 is an equidigital number, since it uses as much as digits as its factorization.

40015031561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 26.

Adding to 40015031561 its reverse (16513051004), we get a palindrome (56528082565).

The spelling of 40015031561 in words is "forty billion, fifteen million, thirty-one thousand, five hundred sixty-one".