861708249 has 12 divisors (see below), whose sum is σ = 1245380656. Its totient is φ = 574153272.

The previous prime is 861708181. The next prime is 861708269. The reversal of 861708249 is 942807168.

861708249 is a `hidden beast` number, since 8 + 617 + 0 + 8 + 24 + 9 = 666.

It is not a de Polignac number, because 861708249 - 2¹³ = 861700057 is a prime.

It is a super-2 number, since 2×861708249² = 1485082212789292002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861708269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8839 + ... + 42444.

Almost surely, 2^861708249 is an apocalyptic number.

It is an amenable number.

861708249 is a deficient number, since it is larger than the sum of its proper divisors (383672407).

861708249 is a wasteful number, since it uses less digits than its factorization.

861708249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53156 (or 53153 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 861708249 is about 29354.8675520773. The cubic root of 861708249 is about 951.5977725655.

The spelling of 861708249 in words is "eight hundred sixty-one million, seven hundred eight thousand, two hundred forty-nine".