42979513 has 4 divisors (see below), whose sum is σ = 43039360. Its totient is φ = 42919668.

The previous prime is 42979507. The next prime is 42979523. The reversal of 42979513 is 31597924.

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 42979513 - 2¹⁷ = 42848441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42979523) 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, 28833 + ... + 30286.

It is an arithmetic number, because the mean of its divisors is an integer number (10759840).

Almost surely, 2^42979513 is an apocalyptic number.

It is an amenable number.

42979513 is a deficient number, since it is larger than the sum of its proper divisors (59847).

42979513 is an equidigital number, since it uses as much as digits as its factorization.

42979513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59846.

The product of its digits is 68040, while the sum is 40.

The square root of 42979513 is about 6555.8762190877. The cubic root of 42979513 is about 350.2841583504.

The spelling of 42979513 in words is "forty-two million, nine hundred seventy-nine thousand, five hundred thirteen".