869891247245 has 54 divisors (see below), whose sum is σ = 1142510560542. Its totient is φ = 635711110272.

The previous prime is 869891247221. The next prime is 869891247257. The reversal of 869891247245 is 542742198968.

It can be written as a sum of positive squares in 9 ways, for example, as 86260864804 + 783630382441 = 293702^2 + 885229^2 .

It is not a de Polignac number, because 869891247245 - 2¹⁴ = 869891230861 is a prime.

It is a Duffinian number.

Its product of digits (69672960) is a multiple of the sum of its prime divisors (810).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 1149129407 + ... + 1149130163.

It is an arithmetic number, because the mean of its divisors is an integer number (21157602973).

Almost surely, 2^869891247245 is an apocalyptic number.

It is an amenable number.

869891247245 is a deficient number, since it is larger than the sum of its proper divisors (272619313297).

869891247245 is an frugal number, since it uses more digits than its factorization.

869891247245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615 (or 810 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 65.

The spelling of 869891247245 in words is "eight hundred sixty-nine billion, eight hundred ninety-one million, two hundred forty-seven thousand, two hundred forty-five".