38961521 has 4 divisors (see below), whose sum is σ = 39911844. Its totient is φ = 38011200.

The previous prime is 38961511. The next prime is 38961539. The reversal of 38961521 is 12516983.

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 6071296 + 32890225 = 2464^2 + 5735^2 .

It is a cyclic number.

It is not a de Polignac number, because 38961521 - 2¹⁰ = 38960497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38961511) 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, 475100 + ... + 475181.

It is an arithmetic number, because the mean of its divisors is an integer number (9977961).

Almost surely, 2^38961521 is an apocalyptic number.

It is an amenable number.

38961521 is a deficient number, since it is larger than the sum of its proper divisors (950323).

38961521 is an equidigital number, since it uses as much as digits as its factorization.

38961521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950322.

The product of its digits is 12960, while the sum is 35.

The square root of 38961521 is about 6241.9164525008. The cubic root of 38961521 is about 339.0095773233.

The spelling of 38961521 in words is "thirty-eight million, nine hundred sixty-one thousand, five hundred twenty-one".