977847617 has 2 divisors, whose sum is σ = 977847618. Its totient is φ = 977847616.

The previous prime is 977847587. The next prime is 977847623. The reversal of 977847617 is 716748779.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 597753601 + 380094016 = 24449^2 + 19496^2 .

It is an emirp because it is prime and its reverse (716748779) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 977847617 - 2¹⁰ = 977846593 is a prime.

It is not a weakly prime, because it can be changed into another prime (977847677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488923808 + 488923809.

It is an arithmetic number, because the mean of its divisors is an integer number (488923809).

Almost surely, 2^977847617 is an apocalyptic number.

It is an amenable number.

977847617 is a deficient number, since it is larger than the sum of its proper divisors (1).

977847617 is an equidigital number, since it uses as much as digits as its factorization.

977847617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4148928, while the sum is 56.

The square root of 977847617 is about 31270.5551117981. Note that the first 3 decimals coincide. The cubic root of 977847617 is about 992.5606658813.

The spelling of 977847617 in words is "nine hundred seventy-seven million, eight hundred forty-seven thousand, six hundred seventeen".