2576131981 has 2 divisors, whose sum is σ = 2576131982. Its totient is φ = 2576131980.

The previous prime is 2576131969. The next prime is 2576131991. The reversal of 2576131981 is 1891316752.

2576131981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2429504100 + 146627881 = 49290^2 + 12109^2 .

It is a cyclic number.

It is not a de Polignac number, because 2576131981 - 2⁵ = 2576131949 is a prime.

It is a super-2 number, since 2×2576131981² = 13272911967061968722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2576131991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1288065990 + 1288065991.

It is an arithmetic number, because the mean of its divisors is an integer number (1288065991).

Almost surely, 2^2576131981 is an apocalyptic number.

It is an amenable number.

2576131981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2576131981 is an equidigital number, since it uses as much as digits as its factorization.

2576131981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 2576131981 is about 50755.6103401388. The cubic root of 2576131981 is about 1370.8482113057.

The spelling of 2576131981 in words is "two billion, five hundred seventy-six million, one hundred thirty-one thousand, nine hundred eighty-one".