861551249 has 8 divisors (see below), whose sum is σ = 928190592. Its totient is φ = 794964240.

The previous prime is 861551231. The next prime is 861551261. The reversal of 861551249 is 942155168.

861551249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 861551249 - 2²⁴ = 844774033 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (861551269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25304 + ... + 48614.

It is an arithmetic number, because the mean of its divisors is an integer number (116023824).

Almost surely, 2^861551249 is an apocalyptic number.

It is an amenable number.

861551249 is a deficient number, since it is larger than the sum of its proper divisors (66639343).

861551249 is a wasteful number, since it uses less digits than its factorization.

861551249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26167.

The product of its digits is 86400, while the sum is 41.

The square root of 861551249 is about 29352.1932570634. The cubic root of 861551249 is about 951.5399765443.

The spelling of 861551249 in words is "eight hundred sixty-one million, five hundred fifty-one thousand, two hundred forty-nine".