4815571981 has 8 divisors (see below), whose sum is σ = 5286813984. Its totient is φ = 4349907120.

The previous prime is 4815571951. The next prime is 4815572011. The reversal of 4815571981 is 1891755184.

It is an interprime number because it is at equal distance from previous prime (4815571951) and next prime (4815572011).

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 4815571981 - 2⁵ = 4815571949 is a prime.

It is a super-2 number, since 2×4815571981² = 46379467008384528722, 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 (4815571951) 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, 1392475 + ... + 1395928.

It is an arithmetic number, because the mean of its divisors is an integer number (660851748).

Almost surely, 2^4815571981 is an apocalyptic number.

It is an amenable number.

4815571981 is a deficient number, since it is larger than the sum of its proper divisors (471242003).

4815571981 is a wasteful number, since it uses less digits than its factorization.

4815571981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2788571.

The product of its digits is 403200, while the sum is 49.

The square root of 4815571981 is about 69394.3223974411. The cubic root of 4815571981 is about 1688.6875167322.

The spelling of 4815571981 in words is "four billion, eight hundred fifteen million, five hundred seventy-one thousand, nine hundred eighty-one".