4920956581 has 4 divisors (see below), whose sum is σ = 4938469164. Its totient is φ = 4903444000.

The previous prime is 4920956479. The next prime is 4920956603. The reversal of 4920956581 is 1856590294.

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 1264940356 + 3656016225 = 35566^2 + 60465^2 .

It is a cyclic number.

It is not a de Polignac number, because 4920956581 - 2²³ = 4912567973 is a prime.

It is a super-2 number, since 2×4920956581² = 48431627344174419122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4920926581) 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, 8755870 + ... + 8756431.

It is an arithmetic number, because the mean of its divisors is an integer number (1234617291).

Almost surely, 2^4920956581 is an apocalyptic number.

It is an amenable number.

4920956581 is a deficient number, since it is larger than the sum of its proper divisors (17512583).

4920956581 is a wasteful number, since it uses less digits than its factorization.

4920956581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17512582.

The product of its (nonzero) digits is 777600, while the sum is 49.

The square root of 4920956581 is about 70149.5301552334. The cubic root of 4920956581 is about 1700.9172191055.

The spelling of 4920956581 in words is "four billion, nine hundred twenty million, nine hundred fifty-six thousand, five hundred eighty-one".