42515819 has 2 divisors, whose sum is σ = 42515820. Its totient is φ = 42515818.

The previous prime is 42515807. The next prime is 42515843. The reversal of 42515819 is 91851524.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42515819 - 2⁸ = 42515563 is a prime.

It is a super-2 number, since 2×42515819² = 3615189730481522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42515219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21257909 + 21257910.

It is an arithmetic number, because the mean of its divisors is an integer number (21257910).

Almost surely, 2^42515819 is an apocalyptic number.

42515819 is a deficient number, since it is larger than the sum of its proper divisors (1).

42515819 is an equidigital number, since it uses as much as digits as its factorization.

42515819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 35.

The square root of 42515819 is about 6520.4155542419. The cubic root of 42515819 is about 349.0198947069.

It can be divided in two parts, 42515 and 819, that added together give a palindrome (43334).

The spelling of 42515819 in words is "forty-two million, five hundred fifteen thousand, eight hundred nineteen".