42451213813 has 2 divisors, whose sum is σ = 42451213814. Its totient is φ = 42451213812.

The previous prime is 42451213807. The next prime is 42451213837. The reversal of 42451213813 is 31831215424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33671149009 + 8780064804 = 183497^2 + 93702^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42451213813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42451213843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21225606906 + 21225606907.

It is an arithmetic number, because the mean of its divisors is an integer number (21225606907).

Almost surely, 2^42451213813 is an apocalyptic number.

It is an amenable number.

42451213813 is a deficient number, since it is larger than the sum of its proper divisors (1).

42451213813 is an equidigital number, since it uses as much as digits as its factorization.

42451213813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 34.

The spelling of 42451213813 in words is "forty-two billion, four hundred fifty-one million, two hundred thirteen thousand, eight hundred thirteen".