981221180231 has 2 divisors, whose sum is σ = 981221180232. Its totient is φ = 981221180230.

The previous prime is 981221180153. The next prime is 981221180237. The reversal of 981221180231 is 132081122189.

981221180231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 981221180231 - 2²⁶ = 981154071367 is a prime.

It is a super-2 number, since 2×981221180231² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981221180237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490610590115 + 490610590116.

It is an arithmetic number, because the mean of its divisors is an integer number (490610590116).

Almost surely, 2^981221180231 is an apocalyptic number.

981221180231 is a deficient number, since it is larger than the sum of its proper divisors (1).

981221180231 is an equidigital number, since it uses as much as digits as its factorization.

981221180231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 38.

The spelling of 981221180231 in words is "nine hundred eighty-one billion, two hundred twenty-one million, one hundred eighty thousand, two hundred thirty-one".