8721961469 has 16 divisors (see below), whose sum is σ = 9948944880. Its totient is φ = 7574753280.

The previous prime is 8721961441. The next prime is 8721961471. The reversal of 8721961469 is 9641691278.

It can be written as a sum of positive squares in 8 ways, for example, as 674077369 + 8047884100 = 25963^2 + 89710^2 .

It is a cyclic number.

It is not a de Polignac number, because 8721961469 - 2¹² = 8721957373 is a prime.

It is a super-2 number, since 2×8721961469² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8721961469.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8721961429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 852617 + ... + 862785.

It is an arithmetic number, because the mean of its divisors is an integer number (621809055).

Almost surely, 2^8721961469 is an apocalyptic number.

It is an amenable number.

8721961469 is a deficient number, since it is larger than the sum of its proper divisors (1226983411).

8721961469 is a wasteful number, since it uses less digits than its factorization.

8721961469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14080.

The product of its digits is 1306368, while the sum is 53.

The square root of 8721961469 is about 93391.4421614743. The cubic root of 8721961469 is about 2058.4392511635.

The spelling of 8721961469 in words is "eight billion, seven hundred twenty-one million, nine hundred sixty-one thousand, four hundred sixty-nine".