617280997 has 2 divisors, whose sum is σ = 617280998. Its totient is φ = 617280996.

The previous prime is 617280991. The next prime is 617281001. The reversal of 617280997 is 799082716.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 554649601 + 62631396 = 23551^2 + 7914^2 .

It is a cyclic number.

It is not a de Polignac number, because 617280997 - 2¹⁹ = 616756709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 617280997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (617280991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308640498 + 308640499.

It is an arithmetic number, because the mean of its divisors is an integer number (308640499).

Almost surely, 2^617280997 is an apocalyptic number.

It is an amenable number.

617280997 is a deficient number, since it is larger than the sum of its proper divisors (1).

617280997 is an equidigital number, since it uses as much as digits as its factorization.

617280997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 49.

The square root of 617280997 is about 24845.1403095253. The cubic root of 617280997 is about 851.4535668487.

The spelling of 617280997 in words is "six hundred seventeen million, two hundred eighty thousand, nine hundred ninety-seven".