997549513 has 2 divisors, whose sum is σ = 997549514. Its totient is φ = 997549512.

The previous prime is 997549507. The next prime is 997549523. The reversal of 997549513 is 315945799.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 946669824 + 50879689 = 30768^2 + 7133^2 .

It is a cyclic number.

It is not a de Polignac number, because 997549513 - 2⁵ = 997549481 is a prime.

It is a super-3 number, since 3×997549513³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (997549523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498774756 + 498774757.

It is an arithmetic number, because the mean of its divisors is an integer number (498774757).

Almost surely, 2^997549513 is an apocalyptic number.

It is an amenable number.

997549513 is a deficient number, since it is larger than the sum of its proper divisors (1).

997549513 is an equidigital number, since it uses as much as digits as its factorization.

997549513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1530900, while the sum is 52.

The square root of 997549513 is about 31584.0072346750. The cubic root of 997549513 is about 999.1825028806.

The spelling of 997549513 in words is "nine hundred ninety-seven million, five hundred forty-nine thousand, five hundred thirteen".