2571673981 has 2 divisors, whose sum is σ = 2571673982. Its totient is φ = 2571673980.

The previous prime is 2571673877. The next prime is 2571674029. The reversal of 2571673981 is 1893761752.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1924225956 + 647448025 = 43866^2 + 25445^2 .

It is a cyclic number.

It is not a de Polignac number, because 2571673981 - 2²¹ = 2569576829 is a prime.

It is a super-2 number, since 2×2571673981² = 13227014129104776722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2571673081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1285836990 + 1285836991.

It is an arithmetic number, because the mean of its divisors is an integer number (1285836991).

Almost surely, 2^2571673981 is an apocalyptic number.

It is an amenable number.

2571673981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2571673981 is an equidigital number, since it uses as much as digits as its factorization.

2571673981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 49.

The square root of 2571673981 is about 50711.6749969866. The cubic root of 2571673981 is about 1370.0570031515.

The spelling of 2571673981 in words is "two billion, five hundred seventy-one million, six hundred seventy-three thousand, nine hundred eighty-one".