3975161581 has 2 divisors, whose sum is σ = 3975161582. Its totient is φ = 3975161580.

The previous prime is 3975161557. The next prime is 3975161609. The reversal of 3975161581 is 1851615793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2923132356 + 1052029225 = 54066^2 + 32435^2 .

It is a cyclic number.

It is not a de Polignac number, because 3975161581 - 2⁷ = 3975161453 is a prime.

It is a super-2 number, since 2×3975161581² = 31603819190116839122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3975161501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1987580790 + 1987580791.

It is an arithmetic number, because the mean of its divisors is an integer number (1987580791).

Almost surely, 2^3975161581 is an apocalyptic number.

It is an amenable number.

3975161581 is a deficient number, since it is larger than the sum of its proper divisors (1).

3975161581 is an equidigital number, since it uses as much as digits as its factorization.

3975161581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 46.

The square root of 3975161581 is about 63048.8824722532. The cubic root of 3975161581 is about 1584.1085163823.

The spelling of 3975161581 in words is "three billion, nine hundred seventy-five million, one hundred sixty-one thousand, five hundred eighty-one".