4131522781 has 2 divisors, whose sum is σ = 4131522782. Its totient is φ = 4131522780.

The previous prime is 4131522757. The next prime is 4131522817. The reversal of 4131522781 is 1872251314.

Together with next prime (4131522817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4002586756 + 128936025 = 63266^2 + 11355^2 .

It is a cyclic number.

It is not a de Polignac number, because 4131522781 - 2¹¹ = 4131520733 is a prime.

It is a super-2 number, since 2×4131522781² = 34138960979843947922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4131522751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2065761390 + 2065761391.

It is an arithmetic number, because the mean of its divisors is an integer number (2065761391).

Almost surely, 2^4131522781 is an apocalyptic number.

It is an amenable number.

4131522781 is a deficient number, since it is larger than the sum of its proper divisors (1).

4131522781 is an equidigital number, since it uses as much as digits as its factorization.

4131522781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 34.

The square root of 4131522781 is about 64276.9226161303. The cubic root of 4131522781 is about 1604.6120549288.

The spelling of 4131522781 in words is "four billion, one hundred thirty-one million, five hundred twenty-two thousand, seven hundred eighty-one".