945551881 has 8 divisors (see below), whose sum is σ = 969078600. Its totient is φ = 922047360.

The previous prime is 945551879. The next prime is 945551899. The reversal of 945551881 is 188155549.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 160655625 + 784896256 = 12675^2 + 28016^2 .

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

It is not a de Polignac number, because 945551881 - 2¹ = 945551879 is a prime.

It is a super-2 number, since 2×945551881² = 1788136719325276322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (945551821) 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, 110215 + ... + 118483.

It is an arithmetic number, because the mean of its divisors is an integer number (121134825).

Almost surely, 2^945551881 is an apocalyptic number.

It is an amenable number.

945551881 is a deficient number, since it is larger than the sum of its proper divisors (23526719).

945551881 is a wasteful number, since it uses less digits than its factorization.

945551881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11099.

The product of its digits is 288000, while the sum is 46.

The square root of 945551881 is about 30749.8273328486. The cubic root of 945551881 is about 981.5108864999.

It can be divided in two parts, 945 and 551881, that added together give a triangular number (552826 = T₁₀₅₁).

The spelling of 945551881 in words is "nine hundred forty-five million, five hundred fifty-one thousand, eight hundred eighty-one".