861002069 has 4 divisors (see below), whose sum is σ = 863806944. Its totient is φ = 858197196.

The previous prime is 861002063. The next prime is 861002089. The reversal of 861002069 is 960200168.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861002069 is a prime.

It is a super-2 number, since 2×861002069² = 1482649125644561522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861002063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1401977 + ... + 1402590.

It is an arithmetic number, because the mean of its divisors is an integer number (215951736).

Almost surely, 2^861002069 is an apocalyptic number.

It is an amenable number.

861002069 is a deficient number, since it is larger than the sum of its proper divisors (2804875).

861002069 is a wasteful number, since it uses less digits than its factorization.

861002069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2804874.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 861002069 is about 29342.8367578869. The cubic root of 861002069 is about 951.3377530172.

The spelling of 861002069 in words is "eight hundred sixty-one million, two thousand, sixty-nine".