617198993 has 2 divisors, whose sum is σ = 617198994. Its totient is φ = 617198992.

The previous prime is 617198929. The next prime is 617199017. The reversal of 617198993 is 399891716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 613404289 + 3794704 = 24767^2 + 1948^2 .

It is a cyclic number.

It is not a de Polignac number, because 617198993 - 2⁶ = 617198929 is a prime.

It is not a weakly prime, because it can be changed into another prime (617198693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308599496 + 308599497.

It is an arithmetic number, because the mean of its divisors is an integer number (308599497).

Almost surely, 2^617198993 is an apocalyptic number.

It is an amenable number.

617198993 is a deficient number, since it is larger than the sum of its proper divisors (1).

617198993 is an equidigital number, since it uses as much as digits as its factorization.

617198993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 53.

The square root of 617198993 is about 24843.4899520981. The cubic root of 617198993 is about 851.4158607954.

The spelling of 617198993 in words is "six hundred seventeen million, one hundred ninety-eight thousand, nine hundred ninety-three".