42515521231 has 2 divisors, whose sum is σ = 42515521232. Its totient is φ = 42515521230.

The previous prime is 42515521219. The next prime is 42515521259. The reversal of 42515521231 is 13212551524.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42515521231 is a prime.

It is a super-2 number, since 2×42515521231² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42515521193 and 42515521202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42515521031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21257760615 + 21257760616.

It is an arithmetic number, because the mean of its divisors is an integer number (21257760616).

Almost surely, 2^42515521231 is an apocalyptic number.

42515521231 is a deficient number, since it is larger than the sum of its proper divisors (1).

42515521231 is an equidigital number, since it uses as much as digits as its factorization.

42515521231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12000, while the sum is 31.

The spelling of 42515521231 in words is "forty-two billion, five hundred fifteen million, five hundred twenty-one thousand, two hundred thirty-one".