42513613 has 4 divisors (see below), whose sum is σ = 43051840. Its totient is φ = 41975388.

The previous prime is 42513599. The next prime is 42513641. The reversal of 42513613 is 31631524.

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.

It is a cyclic number.

It is not a de Polignac number, because 42513613 - 2¹⁷ = 42382541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42513643) 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, 268995 + ... + 269152.

It is an arithmetic number, because the mean of its divisors is an integer number (10762960).

Almost surely, 2^42513613 is an apocalyptic number.

It is an amenable number.

42513613 is a deficient number, since it is larger than the sum of its proper divisors (538227).

42513613 is an equidigital number, since it uses as much as digits as its factorization.

42513613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538226.

The product of its digits is 2160, while the sum is 25.

The square root of 42513613 is about 6520.2463910500. The cubic root of 42513613 is about 349.0138581208.

The spelling of 42513613 in words is "forty-two million, five hundred thirteen thousand, six hundred thirteen".