861615469 has 12 divisors (see below), whose sum is σ = 1019917948. Its totient is φ = 723032640.

The previous prime is 861615463. The next prime is 861615473. The reversal of 861615469 is 964516168.

It can be written as a sum of positive squares in 2 ways, for example, as 54316900 + 807298569 = 7370^2 + 28413^2 .

It is not a de Polignac number, because 861615469 - 2⁷ = 861615341 is a prime.

It is a super-2 number, since 2×861615469² = 1484762432840179922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861615463) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 272304 + ... + 275449.

Almost surely, 2^861615469 is an apocalyptic number.

It is an amenable number.

861615469 is a deficient number, since it is larger than the sum of its proper divisors (158302479).

861615469 is a wasteful number, since it uses less digits than its factorization.

861615469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547788 (or 547777 counting only the distinct ones).

The product of its digits is 311040, while the sum is 46.

The square root of 861615469 is about 29353.2871924083. The cubic root of 861615469 is about 951.5636185425.

The spelling of 861615469 in words is "eight hundred sixty-one million, six hundred fifteen thousand, four hundred sixty-nine".