42451513 has 8 divisors (see below), whose sum is σ = 45883656. Its totient is φ = 39043200.

The previous prime is 42451511. The next prime is 42451531. The reversal of 42451513 is 31515424.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 45369 + 42406144 = 213^2 + 6512^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42451513 - 2¹ = 42451511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42451511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2158 + ... + 9463.

It is an arithmetic number, because the mean of its divisors is an integer number (5735457).

Almost surely, 2^42451513 is an apocalyptic number.

It is an amenable number.

42451513 is a deficient number, since it is larger than the sum of its proper divisors (3432143).

42451513 is a wasteful number, since it uses less digits than its factorization.

42451513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11915.

The product of its digits is 2400, while the sum is 25.

The square root of 42451513 is about 6515.4825607932. The cubic root of 42451513 is about 348.8438394637.

Adding to 42451513 its reverse (31515424), we get a palindrome (73966937).

The spelling of 42451513 in words is "forty-two million, four hundred fifty-one thousand, five hundred thirteen".