993979513 has 2 divisors, whose sum is σ = 993979514. Its totient is φ = 993979512.

The previous prime is 993979489. The next prime is 993979537. The reversal of 993979513 is 315979399.

It is a balanced prime because it is at equal distance from previous prime (993979489) and next prime (993979537).

It can be written as a sum of positive squares in only one way, i.e., 992754064 + 1225449 = 31508^2 + 1107^2 .

It is an emirp because it is prime and its reverse (315979399) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 993979513 - 2²¹ = 991882361 is a prime.

It is not a weakly prime, because it can be changed into another prime (993979573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496989756 + 496989757.

It is an arithmetic number, because the mean of its divisors is an integer number (496989757).

Almost surely, 2^993979513 is an apocalyptic number.

It is an amenable number.

993979513 is a deficient number, since it is larger than the sum of its proper divisors (1).

993979513 is an equidigital number, since it uses as much as digits as its factorization.

993979513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2066715, while the sum is 55.

The square root of 993979513 is about 31527.4406351039. The cubic root of 993979513 is about 997.9891301127.

The spelling of 993979513 in words is "nine hundred ninety-three million, nine hundred seventy-nine thousand, five hundred thirteen".