42098850581 has 4 divisors (see below), whose sum is σ = 42107382732. Its totient is φ = 42090318432.

The previous prime is 42098850539. The next prime is 42098850589. The reversal of 42098850581 is 18505889024.

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 8613510481 + 33485340100 = 92809^2 + 182990^2 .

It is a cyclic number.

It is not a de Polignac number, because 42098850581 - 2⁶ = 42098850517 is a prime.

It is a super-2 number, since 2×42098850581² (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 (42098850589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4258670 + ... + 4268543.

It is an arithmetic number, because the mean of its divisors is an integer number (10526845683).

Almost surely, 2^42098850581 is an apocalyptic number.

It is an amenable number.

42098850581 is a deficient number, since it is larger than the sum of its proper divisors (8532151).

42098850581 is an equidigital number, since it uses as much as digits as its factorization.

42098850581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8532150.

The product of its (nonzero) digits is 921600, while the sum is 50.

The spelling of 42098850581 in words is "forty-two billion, ninety-eight million, eight hundred fifty thousand, five hundred eighty-one".