1871297081 has 2 divisors, whose sum is σ = 1871297082. Its totient is φ = 1871297080.

The previous prime is 1871297047. The next prime is 1871297101. The reversal of 1871297081 is 1807921781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 999571456 + 871725625 = 31616^2 + 29525^2 .

It is a cyclic number.

It is not a de Polignac number, because 1871297081 - 2⁶ = 1871297017 is a prime.

It is a super-2 number, since 2×1871297081² = 7003505530718241122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1871296081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 935648540 + 935648541.

It is an arithmetic number, because the mean of its divisors is an integer number (935648541).

Almost surely, 2^1871297081 is an apocalyptic number.

It is an amenable number.

1871297081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1871297081 is an equidigital number, since it uses as much as digits as its factorization.

1871297081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 44.

The square root of 1871297081 is about 43258.4914323188. The cubic root of 1871297081 is about 1232.2937525573.

The spelling of 1871297081 in words is "one billion, eight hundred seventy-one million, two hundred ninety-seven thousand, eighty-one".