1871497142261 has 2 divisors, whose sum is σ = 1871497142262. Its totient is φ = 1871497142260.

The previous prime is 1871497142257. The next prime is 1871497142279. The reversal of 1871497142261 is 1622417941781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1554088850161 + 317408292100 = 1246631^2 + 563390^2 .

It is a cyclic number.

It is not a de Polignac number, because 1871497142261 - 2² = 1871497142257 is a prime.

It is a super-3 number, since 3×1871497142261³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1871497162261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 935748571130 + 935748571131.

It is an arithmetic number, because the mean of its divisors is an integer number (935748571131).

Almost surely, 2^{1871497142261} is an apocalyptic number.

It is an amenable number.

1871497142261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1871497142261 is an equidigital number, since it uses as much as digits as its factorization.

1871497142261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1354752, while the sum is 53.

The spelling of 1871497142261 in words is "one trillion, eight hundred seventy-one billion, four hundred ninety-seven million, one hundred forty-two thousand, two hundred sixty-one".