8631561073 has 8 divisors (see below), whose sum is σ = 8940957480. Its totient is φ = 8322948480.

The previous prime is 8631561047. The next prime is 8631561119. The reversal of 8631561073 is 3701651368.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 812934144 + 7818626929 = 28512^2 + 88423^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 8631561073 - 2¹⁷ = 8631430001 is a prime.

It is a super-2 number, since 2×8631561073² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8631561373) 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, 173490 + ... + 217627.

It is an arithmetic number, because the mean of its divisors is an integer number (1117619685).

Almost surely, 2^8631561073 is an apocalyptic number.

It is an amenable number.

8631561073 is a deficient number, since it is larger than the sum of its proper divisors (309396407).

8631561073 is a wasteful number, since it uses less digits than its factorization.

8631561073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391907.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 8631561073 is about 92906.1950194926. The cubic root of 8631561073 is about 2051.3028460623.

The spelling of 8631561073 in words is "eight billion, six hundred thirty-one million, five hundred sixty-one thousand, seventy-three".