861015969 has 24 divisors (see below), whose sum is σ = 1379757600. Its totient is φ = 512979840.

The previous prime is 861015943. The next prime is 861015977. The reversal of 861015969 is 969510168.

It is not a de Polignac number, because 861015969 - 2¹² = 861011873 is a prime.

It is a super-2 number, since 2×861015969² = 1482696997746017922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (861015919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67864 + ... + 79545.

It is an arithmetic number, because the mean of its divisors is an integer number (57489900).

Almost surely, 2^861015969 is an apocalyptic number.

It is an amenable number.

861015969 is a deficient number, since it is larger than the sum of its proper divisors (518741631).

861015969 is a wasteful number, since it uses less digits than its factorization.

861015969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147485 (or 147482 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 861015969 is about 29343.0736120128. The cubic root of 861015969 is about 951.3428724488.

The spelling of 861015969 in words is "eight hundred sixty-one million, fifteen thousand, nine hundred sixty-nine".