38115521 has 4 divisors (see below), whose sum is σ = 38225712. Its totient is φ = 38005332.

The previous prime is 38115457. The next prime is 38115529. The reversal of 38115521 is 12551183.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12551183 = 191 ⋅65713.

It is a cyclic number.

It is not a de Polignac number, because 38115521 - 2⁶ = 38115457 is a prime.

It is a super-2 number, since 2×38115521² = 2905585882202882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38115529) 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, 54575 + ... + 55268.

It is an arithmetic number, because the mean of its divisors is an integer number (9556428).

Almost surely, 2^38115521 is an apocalyptic number.

It is an amenable number.

38115521 is a deficient number, since it is larger than the sum of its proper divisors (110191).

38115521 is a wasteful number, since it uses less digits than its factorization.

38115521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110190.

The product of its digits is 1200, while the sum is 26.

The square root of 38115521 is about 6173.7768829137. The cubic root of 38115521 is about 336.5378791569.

The spelling of 38115521 in words is "thirty-eight million, one hundred fifteen thousand, five hundred twenty-one".