42545431109 has 2 divisors, whose sum is σ = 42545431110. Its totient is φ = 42545431108.

The previous prime is 42545431079. The next prime is 42545431111. The reversal of 42545431109 is 90113454524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24576832900 + 17968598209 = 156770^2 + 134047^2 .

It is a cyclic number.

It is not a de Polignac number, because 42545431109 - 2¹² = 42545427013 is a prime.

It is a super-2 number, since 2×42545431109² (a number of 22 digits) contains 22 as substring.

Together with 42545431111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42545431139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21272715554 + 21272715555.

It is an arithmetic number, because the mean of its divisors is an integer number (21272715555).

Almost surely, 2^42545431109 is an apocalyptic number.

It is an amenable number.

42545431109 is a deficient number, since it is larger than the sum of its proper divisors (1).

42545431109 is an equidigital number, since it uses as much as digits as its factorization.

42545431109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 42545431109 in words is "forty-two billion, five hundred forty-five million, four hundred thirty-one thousand, one hundred nine".