2142671581 has 2 divisors, whose sum is σ = 2142671582. Its totient is φ = 2142671580.

The previous prime is 2142671563. The next prime is 2142671599. The reversal of 2142671581 is 1851762412.

It is a balanced prime because it is at equal distance from previous prime (2142671563) and next prime (2142671599).

It can be written as a sum of positive squares in only one way, i.e., 1114892100 + 1027779481 = 33390^2 + 32059^2 .

It is a cyclic number.

It is not a de Polignac number, because 2142671581 - 2¹⁷ = 2142540509 is a prime.

It is a super-2 number, since 2×2142671581² = 9182083008050079122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2142671581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2142671281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071335790 + 1071335791.

It is an arithmetic number, because the mean of its divisors is an integer number (1071335791).

Almost surely, 2^2142671581 is an apocalyptic number.

It is an amenable number.

2142671581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2142671581 is an equidigital number, since it uses as much as digits as its factorization.

2142671581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 37.

The square root of 2142671581 is about 46289.0006481021. Note that the first 3 decimals coincide. The cubic root of 2142671581 is about 1289.1947744045.

The spelling of 2142671581 in words is "two billion, one hundred forty-two million, six hundred seventy-one thousand, five hundred eighty-one".