2961908581 has 2 divisors, whose sum is σ = 2961908582. Its totient is φ = 2961908580.

The previous prime is 2961908567. The next prime is 2961908617. The reversal of 2961908581 is 1858091692.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1584756481 + 1377152100 = 39809^2 + 37110^2 .

It is a cyclic number.

It is not a de Polignac number, because 2961908581 - 2¹¹ = 2961906533 is a prime.

It is a super-2 number, since 2×2961908581² = 17545804884402867122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2961908681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1480954290 + 1480954291.

It is an arithmetic number, because the mean of its divisors is an integer number (1480954291).

Almost surely, 2^2961908581 is an apocalyptic number.

It is an amenable number.

2961908581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2961908581 is an equidigital number, since it uses as much as digits as its factorization.

2961908581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 49.

The square root of 2961908581 is about 54423.4194166445. The cubic root of 2961908581 is about 1436.1194033609.

The spelling of 2961908581 in words is "two billion, nine hundred sixty-one million, nine hundred eight thousand, five hundred eighty-one".