861404519 has 2 divisors, whose sum is σ = 861404520. Its totient is φ = 861404518.

The previous prime is 861404507. The next prime is 861404591. The reversal of 861404519 is 915404168.

Together with next prime (861404591) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861404519 - 2⁴ = 861404503 is a prime.

It is a super-2 number, since 2×861404519² = 1484035490707242722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861403519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430702259 + 430702260.

It is an arithmetic number, because the mean of its divisors is an integer number (430702260).

Almost surely, 2^861404519 is an apocalyptic number.

861404519 is a deficient number, since it is larger than the sum of its proper divisors (1).

861404519 is an equidigital number, since it uses as much as digits as its factorization.

861404519 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 861404519 is about 29349.6936781289. The cubic root of 861404519 is about 951.4859548450.

The spelling of 861404519 in words is "eight hundred sixty-one million, four hundred four thousand, five hundred nineteen".