42091464781 has 4 divisors (see below), whose sum is σ = 42210704412. Its totient is φ = 41972225152.

The previous prime is 42091464773. The next prime is 42091464787. The reversal of 42091464781 is 18746419024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21982806756 + 20108658025 = 148266^2 + 141805^2 .

It is a cyclic number.

It is not a de Polignac number, because 42091464781 - 2³ = 42091464773 is a prime.

It is a super-2 number, since 2×42091464781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42091464787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59619286 + ... + 59619991.

It is an arithmetic number, because the mean of its divisors is an integer number (10552676103).

Almost surely, 2^42091464781 is an apocalyptic number.

It is an amenable number.

42091464781 is a deficient number, since it is larger than the sum of its proper divisors (119239631).

42091464781 is a wasteful number, since it uses less digits than its factorization.

42091464781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119239630.

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 42091464781 in words is "forty-two billion, ninety-one million, four hundred sixty-four thousand, seven hundred eighty-one".