861252587471 has 2 divisors, whose sum is σ = 861252587472. Its totient is φ = 861252587470.

The previous prime is 861252587449. The next prime is 861252587491. The reversal of 861252587471 is 174785252168.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 861252587471 - 2²² = 861248393167 is a prime.

It is a super-3 number, since 3×861252587471³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861252587401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430626293735 + 430626293736.

It is an arithmetic number, because the mean of its divisors is an integer number (430626293736).

Almost surely, 2^861252587471 is an apocalyptic number.

861252587471 is a deficient number, since it is larger than the sum of its proper divisors (1).

861252587471 is an equidigital number, since it uses as much as digits as its factorization.

861252587471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7526400, while the sum is 56.

The spelling of 861252587471 in words is "eight hundred sixty-one billion, two hundred fifty-two million, five hundred eighty-seven thousand, four hundred seventy-one".