861151511 has 8 divisors (see below), whose sum is σ = 969742848. Its totient is φ = 757611000.

The previous prime is 861151493. The next prime is 861151519. The reversal of 861151511 is 115151168.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861151511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861151519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1262345 + ... + 1263026.

It is an arithmetic number, because the mean of its divisors is an integer number (121217856).

Almost surely, 2^861151511 is an apocalyptic number.

861151511 is a deficient number, since it is larger than the sum of its proper divisors (108591337).

861151511 is a wasteful number, since it uses less digits than its factorization.

861151511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2525413.

The product of its digits is 1200, while the sum is 29.

The square root of 861151511 is about 29345.3831292079. The cubic root of 861151511 is about 951.3927902802.

The spelling of 861151511 in words is "eight hundred sixty-one million, one hundred fifty-one thousand, five hundred eleven".