181079021573 has 2 divisors, whose sum is σ = 181079021574. Its totient is φ = 181079021572.

The previous prime is 181079021569. The next prime is 181079021621. The reversal of 181079021573 is 375120970181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168968679364 + 12110342209 = 411058^2 + 110047^2 .

It is an emirp because it is prime and its reverse (375120970181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181079021573 - 2² = 181079021569 is a prime.

It is a super-2 number, since 2×181079021573² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181079071573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90539510786 + 90539510787.

It is an arithmetic number, because the mean of its divisors is an integer number (90539510787).

Almost surely, 2^181079021573 is an apocalyptic number.

It is an amenable number.

181079021573 is a deficient number, since it is larger than the sum of its proper divisors (1).

181079021573 is an equidigital number, since it uses as much as digits as its factorization.

181079021573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 44.

The spelling of 181079021573 in words is "one hundred eighty-one billion, seventy-nine million, twenty-one thousand, five hundred seventy-three".