38521561 has 16 divisors (see below), whose sum is σ = 43552768. Its totient is φ = 33825600.

The previous prime is 38521543. The next prime is 38521579. The reversal of 38521561 is 16512583.

It is an interprime number because it is at equal distance from previous prime (38521543) and next prime (38521579).

It is a cyclic number.

It is not a de Polignac number, because 38521561 - 2¹¹ = 38519513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (38521061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23800 + ... + 25366.

It is an arithmetic number, because the mean of its divisors is an integer number (2722048).

Almost surely, 2^38521561 is an apocalyptic number.

38521561 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

38521561 is a deficient number, since it is larger than the sum of its proper divisors (5031207).

38521561 is a wasteful number, since it uses less digits than its factorization.

38521561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672.

The product of its digits is 7200, while the sum is 31.

The square root of 38521561 is about 6206.5740147041. The cubic root of 38521561 is about 337.7286929202.

The spelling of 38521561 in words is "thirty-eight million, five hundred twenty-one thousand, five hundred sixty-one".