981221180237 has 2 divisors, whose sum is σ = 981221180238. Its totient is φ = 981221180236.

The previous prime is 981221180231. The next prime is 981221180249. The reversal of 981221180237 is 732081122189.

981221180237 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 750188105956 + 231033074281 = 866134^2 + 480659^2 .

It is an emirp because it is prime and its reverse (732081122189) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981221180237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981221180231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490610590118 + 490610590119.

It is an arithmetic number, because the mean of its divisors is an integer number (490610590119).

Almost surely, 2^981221180237 is an apocalyptic number.

It is an amenable number.

981221180237 is a deficient number, since it is larger than the sum of its proper divisors (1).

981221180237 is an equidigital number, since it uses as much as digits as its factorization.

981221180237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 44.

The spelling of 981221180237 in words is "nine hundred eighty-one billion, two hundred twenty-one million, one hundred eighty thousand, two hundred thirty-seven".