39013561 has 4 divisors (see below), whose sum is σ = 39253072. Its totient is φ = 38774052.

The previous prime is 39013553. The next prime is 39013567. The reversal of 39013561 is 16531093.

39013561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 16531093 = 2791 ⋅5923.

It is a cyclic number.

It is not a de Polignac number, because 39013561 - 2³ = 39013553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39013567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119511 + ... + 119836.

It is an arithmetic number, because the mean of its divisors is an integer number (9813268).

Almost surely, 2^39013561 is an apocalyptic number.

It is an amenable number.

39013561 is a deficient number, since it is larger than the sum of its proper divisors (239511).

39013561 is a wasteful number, since it uses less digits than its factorization.

39013561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239510.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 39013561 is about 6246.0836529781. The cubic root of 39013561 is about 339.1604459160.

The spelling of 39013561 in words is "thirty-nine million, thirteen thousand, five hundred sixty-one".