42154813 has 2 divisors, whose sum is σ = 42154814. Its totient is φ = 42154812.

The previous prime is 42154807. The next prime is 42154841. The reversal of 42154813 is 31845124.

It is an a-pointer prime, because the next prime (42154841) can be obtained adding 42154813 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36264484 + 5890329 = 6022^2 + 2427^2 .

It is a cyclic number.

It is not a de Polignac number, because 42154813 - 2¹⁷ = 42023741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42154873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21077406 + 21077407.

It is an arithmetic number, because the mean of its divisors is an integer number (21077407).

Almost surely, 2^42154813 is an apocalyptic number.

It is an amenable number.

42154813 is a deficient number, since it is larger than the sum of its proper divisors (1).

42154813 is an equidigital number, since it uses as much as digits as its factorization.

42154813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 28.

The square root of 42154813 is about 6492.6737943624. The cubic root of 42154813 is about 348.0292313711.

Adding to 42154813 its reverse (31845124), we get a palindrome (73999937).

The spelling of 42154813 in words is "forty-two million, one hundred fifty-four thousand, eight hundred thirteen".