861213669 has 8 divisors (see below), whose sum is σ = 1149707520. Its totient is φ = 573431136.

The previous prime is 861213653. The next prime is 861213673. The reversal of 861213669 is 966312168.

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

It is not a de Polignac number, because 861213669 - 2⁴ = 861213653 is a prime.

It is a super-2 number, since 2×861213669² = 1483377967344883122, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 861213669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861213629) 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, 174997 + ... + 179850.

It is an arithmetic number, because the mean of its divisors is an integer number (143713440).

Almost surely, 2^861213669 is an apocalyptic number.

It is an amenable number.

861213669 is a deficient number, since it is larger than the sum of its proper divisors (288493851).

861213669 is a wasteful number, since it uses less digits than its factorization.

861213669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355659.

The product of its digits is 93312, while the sum is 42.

The square root of 861213669 is about 29346.4421864048. The cubic root of 861213669 is about 951.4156802709.

The spelling of 861213669 in words is "eight hundred sixty-one million, two hundred thirteen thousand, six hundred sixty-nine".