978117653 has 2 divisors, whose sum is σ = 978117654. Its totient is φ = 978117652.

The previous prime is 978117629. The next prime is 978117659. The reversal of 978117653 is 356711879.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 935319889 + 42797764 = 30583^2 + 6542^2 .

It is a cyclic number.

It is not a de Polignac number, because 978117653 - 2⁶ = 978117589 is a prime.

It is a super-2 number, since 2×978117653² = 1913428286220456818, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 978117598 and 978117607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978117659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489058826 + 489058827.

It is an arithmetic number, because the mean of its divisors is an integer number (489058827).

Almost surely, 2^978117653 is an apocalyptic number.

It is an amenable number.

978117653 is a deficient number, since it is larger than the sum of its proper divisors (1).

978117653 is an equidigital number, since it uses as much as digits as its factorization.

978117653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 47.

The square root of 978117653 is about 31274.8725497003. The cubic root of 978117653 is about 992.6520238253.

The spelling of 978117653 in words is "nine hundred seventy-eight million, one hundred seventeen thousand, six hundred fifty-three".