31433741561 has 2 divisors, whose sum is σ = 31433741562. Its totient is φ = 31433741560.

The previous prime is 31433741503. The next prime is 31433741587. The reversal of 31433741561 is 16514733413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16225919161 + 15207822400 = 127381^2 + 123320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31433741561 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 (31433761561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15716870780 + 15716870781.

It is an arithmetic number, because the mean of its divisors is an integer number (15716870781).

Almost surely, 2^31433741561 is an apocalyptic number.

It is an amenable number.

31433741561 is a deficient number, since it is larger than the sum of its proper divisors (1).

31433741561 is an equidigital number, since it uses as much as digits as its factorization.

31433741561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 38.

The spelling of 31433741561 in words is "thirty-one billion, four hundred thirty-three million, seven hundred forty-one thousand, five hundred sixty-one".