978276557 has 2 divisors, whose sum is σ = 978276558. Its totient is φ = 978276556.

The previous prime is 978276547. The next prime is 978276589. The reversal of 978276557 is 755672879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 629558281 + 348718276 = 25091^2 + 18674^2 .

It is a cyclic number.

It is not a de Polignac number, because 978276557 - 2⁶ = 978276493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978276547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489138278 + 489138279.

It is an arithmetic number, because the mean of its divisors is an integer number (489138279).

Almost surely, 2^978276557 is an apocalyptic number.

It is an amenable number.

978276557 is a deficient number, since it is larger than the sum of its proper divisors (1).

978276557 is an equidigital number, since it uses as much as digits as its factorization.

978276557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7408800, while the sum is 56.

The square root of 978276557 is about 31277.4128885367. The cubic root of 978276557 is about 992.7057759943.

The spelling of 978276557 in words is "nine hundred seventy-eight million, two hundred seventy-six thousand, five hundred fifty-seven".