998773261 has 2 divisors, whose sum is σ = 998773262. Its totient is φ = 998773260.

The previous prime is 998773249. The next prime is 998773267. The reversal of 998773261 is 162377899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 863772100 + 135001161 = 29390^2 + 11619^2 .

It is an emirp because it is prime and its reverse (162377899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998773261 - 2¹⁵ = 998740493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 998773199 and 998773208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998773267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499386630 + 499386631.

It is an arithmetic number, because the mean of its divisors is an integer number (499386631).

Almost surely, 2^998773261 is an apocalyptic number.

It is an amenable number.

998773261 is a deficient number, since it is larger than the sum of its proper divisors (1).

998773261 is an equidigital number, since it uses as much as digits as its factorization.

998773261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 52.

The square root of 998773261 is about 31603.3742027651. The cubic root of 998773261 is about 999.5909196761.

The spelling of 998773261 in words is "nine hundred ninety-eight million, seven hundred seventy-three thousand, two hundred sixty-one".