4639528381 has 2 divisors, whose sum is σ = 4639528382. Its totient is φ = 4639528380.

The previous prime is 4639528339. The next prime is 4639528391. The reversal of 4639528381 is 1838259364.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4474405881 + 165122500 = 66891^2 + 12850^2 .

It is a cyclic number.

It is not a de Polignac number, because 4639528381 - 2¹⁷ = 4639397309 is a prime.

It is a super-2 number, since 2×4639528381² = 43050447196208962322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4639528391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2319764190 + 2319764191.

It is an arithmetic number, because the mean of its divisors is an integer number (2319764191).

Almost surely, 2^4639528381 is an apocalyptic number.

It is an amenable number.

4639528381 is a deficient number, since it is larger than the sum of its proper divisors (1).

4639528381 is an equidigital number, since it uses as much as digits as its factorization.

4639528381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 49.

The square root of 4639528381 is about 68114.0835730761. The cubic root of 4639528381 is about 1667.8536712425.

The spelling of 4639528381 in words is "four billion, six hundred thirty-nine million, five hundred twenty-eight thousand, three hundred eighty-one".