978261 has 4 divisors (see below), whose sum is σ = 1304352. Its totient is φ = 652172.

The previous prime is 978239. The next prime is 978269. The reversal of 978261 is 162879.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 162879 = 3 ⋅54293.

It is a cyclic number.

It is not a de Polignac number, because 978261 - 2¹³ = 970069 is a prime.

It is a D-number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163041 + ... + 163046.

It is an arithmetic number, because the mean of its divisors is an integer number (326088).

2⁹⁷⁸²⁶¹ is an apocalyptic number.

It is an amenable number.

978261 is a deficient number, since it is larger than the sum of its proper divisors (326091).

978261 is a wasteful number, since it uses less digits than its factorization.

978261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326090.

The product of its digits is 6048, while the sum is 33.

The square root of 978261 is about 989.0707760317. The cubic root of 978261 is about 99.2700513813.

The spelling of 978261 in words is "nine hundred seventy-eight thousand, two hundred sixty-one".