978902549 has 2 divisors, whose sum is σ = 978902550. Its totient is φ = 978902548.

The previous prime is 978902521. The next prime is 978902579. The reversal of 978902549 is 945209879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 924585649 + 54316900 = 30407^2 + 7370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978902549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 978902549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978902579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489451274 + 489451275.

It is an arithmetic number, because the mean of its divisors is an integer number (489451275).

Almost surely, 2^978902549 is an apocalyptic number.

It is an amenable number.

978902549 is a deficient number, since it is larger than the sum of its proper divisors (1).

978902549 is an equidigital number, since it uses as much as digits as its factorization.

978902549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The square root of 978902549 is about 31287.4183818352. The cubic root of 978902549 is about 992.9174725635.

The spelling of 978902549 in words is "nine hundred seventy-eight million, nine hundred two thousand, five hundred forty-nine".