2981771521 has 2 divisors, whose sum is σ = 2981771522. Its totient is φ = 2981771520.

The previous prime is 2981771519. The next prime is 2981771557. The reversal of 2981771521 is 1251771892.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2920321600 + 61449921 = 54040^2 + 7839^2 .

It is a cyclic number.

It is not a de Polignac number, because 2981771521 - 2¹ = 2981771519 is a prime.

It is a super-2 number, since 2×2981771521² = 17781922806893306882, which contains 22 as substring.

Together with 2981771519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2981771501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1490885760 + 1490885761.

It is an arithmetic number, because the mean of its divisors is an integer number (1490885761).

Almost surely, 2^2981771521 is an apocalyptic number.

It is an amenable number.

2981771521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2981771521 is an equidigital number, since it uses as much as digits as its factorization.

2981771521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 43.

The square root of 2981771521 is about 54605.5997220065. The cubic root of 2981771521 is about 1439.3225209823.

The spelling of 2981771521 in words is "two billion, nine hundred eighty-one million, seven hundred seventy-one thousand, five hundred twenty-one".