42291387781 has 16 divisors (see below), whose sum is σ = 45719807616. Its totient is φ = 38974611456.

The previous prime is 42291387773. The next prime is 42291387791. The reversal of 42291387781 is 18778319224.

42291387781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 42291387781 - 2³ = 42291387773 is a prime.

It is a super-2 number, since 2×42291387781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42291387791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79045 + ... + 301381.

It is an arithmetic number, because the mean of its divisors is an integer number (2857487976).

Almost surely, 2^42291387781 is an apocalyptic number.

It is an amenable number.

42291387781 is a deficient number, since it is larger than the sum of its proper divisors (3428419835).

42291387781 is a wasteful number, since it uses less digits than its factorization.

42291387781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222588.

The product of its digits is 1354752, while the sum is 52.

The spelling of 42291387781 in words is "forty-two billion, two hundred ninety-one million, three hundred eighty-seven thousand, seven hundred eighty-one".