981555241 has 2 divisors, whose sum is σ = 981555242. Its totient is φ = 981555240.

The previous prime is 981555233. The next prime is 981555247. The reversal of 981555241 is 142555189.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 923856025 + 57699216 = 30395^2 + 7596^2 .

It is a cyclic number.

It is not a de Polignac number, because 981555241 - 2³ = 981555233 is a prime.

It is a super-2 number, since 2×981555241² = 1926901382269136162, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 981555194 and 981555203.

It is not a weakly prime, because it can be changed into another prime (981555247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490777620 + 490777621.

It is an arithmetic number, because the mean of its divisors is an integer number (490777621).

Almost surely, 2^981555241 is an apocalyptic number.

It is an amenable number.

981555241 is a deficient number, since it is larger than the sum of its proper divisors (1).

981555241 is an equidigital number, since it uses as much as digits as its factorization.

981555241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72000, while the sum is 40.

The square root of 981555241 is about 31329.7820132857. The cubic root of 981555241 is about 993.8135538063.

It can be divided in two parts, 9815 and 55241, that added together give a palindrome (65056).

The spelling of 981555241 in words is "nine hundred eighty-one million, five hundred fifty-five thousand, two hundred forty-one".