2931951661 has 2 divisors, whose sum is σ = 2931951662. Its totient is φ = 2931951660.

The previous prime is 2931951613. The next prime is 2931951719. The reversal of 2931951661 is 1661591392.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1842555625 + 1089396036 = 42925^2 + 33006^2 .

It is a cyclic number.

It is not a de Polignac number, because 2931951661 - 2¹⁵ = 2931918893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2931951601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1465975830 + 1465975831.

It is an arithmetic number, because the mean of its divisors is an integer number (1465975831).

Almost surely, 2^2931951661 is an apocalyptic number.

It is an amenable number.

2931951661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2931951661 is an equidigital number, since it uses as much as digits as its factorization.

2931951661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 43.

The square root of 2931951661 is about 54147.4991204580. The cubic root of 2931951661 is about 1431.2613222956.

The spelling of 2931951661 in words is "two billion, nine hundred thirty-one million, nine hundred fifty-one thousand, six hundred sixty-one".