8815954621 has 4 divisors (see below), whose sum is σ = 8816155452. Its totient is φ = 8815753792.

The previous prime is 8815954619. The next prime is 8815954633. The reversal of 8815954621 is 1264595188.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2582062596 + 6233892025 = 50814^2 + 78955^2 .

It is a cyclic number.

It is not a de Polignac number, because 8815954621 - 2¹ = 8815954619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8815954601) 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, 3190 + ... + 132823.

It is an arithmetic number, because the mean of its divisors is an integer number (2204038863).

Almost surely, 2^8815954621 is an apocalyptic number.

It is an amenable number.

8815954621 is a deficient number, since it is larger than the sum of its proper divisors (200831).

8815954621 is a wasteful number, since it uses less digits than its factorization.

8815954621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200830.

The product of its digits is 691200, while the sum is 49.

The square root of 8815954621 is about 93893.3151028336. The cubic root of 8815954621 is about 2065.8071774833.

The spelling of 8815954621 in words is "eight billion, eight hundred fifteen million, nine hundred fifty-four thousand, six hundred twenty-one".